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You guessed it, Math homework.

Blogs > OmgIRok
Post a Reply
OmgIRok
Profile Blog Joined June 2008
Taiwan2699 Posts
February 19 2009 01:48 GMT
#1
My class started the probability and statistics chapter.. and since we took a test today, we're supposed to learn this section ourselves, but why would you do that when you can just ask TL and they'll give help? (hopefully)

Yes, I do know the fundamental counting principle.

But, I don't understand how I'm supposed to make the equation so I can solve it. I might update the OP with more questions that I'll need help on, so don't go away I need this help!

#1) How many ways can six different books be arranged on a shelf if one of the books is a dictionary and it must be on an end?

I know the answer is 240 from the back of the book, but I have no idea where the got the numbers from.

#2) How many different 5-digit codes are possible using a keypad if the first digit isn't zero and no digits are allowed to repeat.

Having the same problem as above, don't know how to set up the equation. =\

a keypad is
789
456
123
x0x
in case you didn't know.
Thanks for the help! (If I get any, ._.)

I thought about using TL Manpower, but I don't really have the time to wait for a PM (._. i'm sorry I'm impatient and blogs get faster replies and I also don't know the available times of the people on TL Manpower[Maybe a 'convenient times' could be a part of the TL Manpower resume?] so I decided to go with a blog. Now that I have taken a few minutes out of my time to type this, won't you please take a few minutes out of your time to do some math for me?

*
"Wanna join my [combo] clan?" "We play turret d competitively"
GeneralStan
Profile Blog Joined August 2007
United States4789 Posts
February 19 2009 01:52 GMT
#2
I guessed girl blog, actually
¯\_(ツ)_/¯
NovaTheFeared
Profile Blog Joined October 2004
United States7222 Posts
February 19 2009 01:55 GMT
#3
1) 5! (for the ways 5 books can be arranged in any order) x 2 (number of places the dictionary can be placed)

5x4x3x2x1x2=240

2) Does the question mean repeat in sequence or repeat as in be used a 2nd time. Ex. 311 or 313 being incorrect?
日本語が分かりますか
OmgIRok
Profile Blog Joined June 2008
Taiwan2699 Posts
February 19 2009 01:58 GMT
#4
Oohh Niceee explanation of #1

but #2 just means that it has to be like 12345 no numbers can be used more than once
"Wanna join my [combo] clan?" "We play turret d competitively"
micronesia
Profile Blog Joined July 2006
United States24653 Posts
Last Edited: 2009-02-19 02:00:02
February 19 2009 01:58 GMT
#5
Same Question as NovaTheFeared...

If it just means you can't repeat it twice in a row, then the answer should be 9^5 since there are nine options other than zero for the first digit, and then nine options that don't repeat thereafter.

edit: oh in that case it's trickier

first digit: 9 options
second digit: 9 options
third digit: 8 options
fourth: 7 options
fifth: 6 options

9*9*8*7*6
ModeratorThere are animal crackers for people and there are people crackers for animals.
NovaTheFeared
Profile Blog Joined October 2004
United States7222 Posts
Last Edited: 2009-02-19 02:00:25
February 19 2009 01:59 GMT
#6
Considering the difficulty of the first question I'm going with instinct.

9 possibilities for the first digit (1-9)
9 possibilities for the 2nd digit (0-9, less the one chosen)
8 possibilities for the 3rd digit
7 possibilities for the 4th digit
6 possibilities for the 5th digit

9*9*8*7*6=27216
日本語が分かりますか
BanZu
Profile Blog Joined June 2008
United States3329 Posts
February 19 2009 01:59 GMT
#7
This stuff is easy as hell, what grade are you in? It makes me think you're extremely lazy to not try to learn this stuff yourself.

#1: If dictionary is first then 5x4x3x2x1 = 120 different positions
The numbers are the number of possible books that could be 2nd,3rd,4th,5th,6th
If dictionary is last then also 5x4x3x2x1 = 120 different positions
The numbers are the number of possible books that could be 1st, 2nd, 3rd, 4th, 5th
240 altogether

#2: 9x9x8x7x6 = 27216
The numbers are the number of possible digits that could be 1st, 2nd, 3rd, 4th, 5th

So ridiculously easy -_-
Sun Tzu once said, "Defiler becomes useless at the presences of a vessel."
OmgIRok
Profile Blog Joined June 2008
Taiwan2699 Posts
February 19 2009 02:04 GMT
#8
ohh dang

i see now!!

i'm just a freshman in high school D=
don't judge me plz
"Wanna join my [combo] clan?" "We play turret d competitively"
OmgIRok
Profile Blog Joined June 2008
Taiwan2699 Posts
February 19 2009 02:26 GMT
#9
Okay uhh next question I'm stuck on (not really stuck I could count this, but I don't know how to setup a formula for this)
How many numbers between 100 & 999 have 7 in the tens place?
Not sure how I would set this up...
would it be like
XYZ
X= hunderds place
Y= Tens place
Z= ones place?
"Wanna join my [combo] clan?" "We play turret d competitively"
mdainoob
Profile Joined June 2007
United States51 Posts
February 19 2009 02:36 GMT
#10
it is 9x1x10 = 90. X can be a number from 1-9 so 9 choices. Y can only be 7 so one choice. Z can be a number from 0-9 so 10 choices.
OmgIRok
Profile Blog Joined June 2008
Taiwan2699 Posts
Last Edited: 2009-02-19 03:03:40
February 19 2009 03:01 GMT
#11
Ahhh I see!!

cool i set it up right

I'm gettin the hang of this shitt yeaaaaaaaaaaa

-is proud-
"Wanna join my [combo] clan?" "We play turret d competitively"
vx70GTOJudgexv
Profile Blog Joined November 2008
United States3161 Posts
February 19 2009 03:01 GMT
#12
On February 19 2009 10:55 NovaTheFeared wrote:
1) 5! (for the ways 5 books can be arranged in any order) x 2 (number of places the dictionary can be placed)


On February 19 2009 10:59 NovaTheFeared wrote:
Considering the difficulty of the first question I'm going with instinct.

9 possibilities for the first digit (1-9)
9 possibilities for the 2nd digit (0-9, less the one chosen)
8 possibilities for the 3rd digit
7 possibilities for the 4th digit
6 possibilities for the 5th digit

9*9*8*7*6=27216


Your homework is done.
(-_-) BW for ever. #1 Iris fan.
Aurious
Profile Blog Joined April 2006
Canada1772 Posts
February 19 2009 03:02 GMT
#13
On February 19 2009 12:01 vx70GTOJudgexv wrote:
Show nested quote +
On February 19 2009 10:55 NovaTheFeared wrote:
1) 5! (for the ways 5 books can be arranged in any order) x 2 (number of places the dictionary can be placed)


Show nested quote +
On February 19 2009 10:59 NovaTheFeared wrote:
Considering the difficulty of the first question I'm going with instinct.

9 possibilities for the first digit (1-9)
9 possibilities for the 2nd digit (0-9, less the one chosen)
8 possibilities for the 3rd digit
7 possibilities for the 4th digit
6 possibilities for the 5th digit

9*9*8*7*6=27216


Your homework is done.

And you are more useless than this post is
v-.-v
Profile Joined February 2009
Canada28 Posts
February 19 2009 03:25 GMT
#14
I did figure out the first question after years without doing stats. As other people have explained for first one, the dictionary has to be the end, then you can only arrange the other 5 books, that leaves 5x4x3x2=120. It says it has to be an end, and you can have it at the front or at the very last, so 120x2 = 240. Didn't attempt #2, have to get back to iccup.
micronesia
Profile Blog Joined July 2006
United States24653 Posts
February 19 2009 03:50 GMT
#15
On February 19 2009 12:01 OmgIRok wrote:
Ahhh I see!!

cool i set it up right

I'm gettin the hang of this shitt yeaaaaaaaaaaa

-is proud-

Be careful. When receiving help its easy to overestimate how much you yourself have actually gotten from the experience. If you took a quiz on this topic tomorrow, how do you think you would do? You'd probably do worse :p
ModeratorThere are animal crackers for people and there are people crackers for animals.
OmgIRok
Profile Blog Joined June 2008
Taiwan2699 Posts
February 19 2009 04:06 GMT
#16
On February 19 2009 12:50 micronesia wrote:
Show nested quote +
On February 19 2009 12:01 OmgIRok wrote:
Ahhh I see!!

cool i set it up right

I'm gettin the hang of this shitt yeaaaaaaaaaaa

-is proud-

Be careful. When receiving help its easy to overestimate how much you yourself have actually gotten from the experience. If you took a quiz on this topic tomorrow, how do you think you would do? You'd probably do worse :p


Eh.. the fact that I finished the rest of my homework without needing anymore help says a lot. (too me it does)
"Wanna join my [combo] clan?" "We play turret d competitively"
ninjafetus
Profile Joined December 2008
United States231 Posts
February 19 2009 04:07 GMT
#17
Micronesia brings up a good point, but I'd like to elaborate.

If you didn't understand at all, and this got you started on the right path, then you've done a good thing by asking for help. If you stop here, you've done a bad thing, since the help you recieved won't stick with you. You want to take what you've learned here, and try and apply it yourself in different situations (ie- problems). Once you can produce a correct answer and are able to explain the reasoning behind it without looking at an example or asking for help, you'll be ready to be tested.
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