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coopersmydog
09-21-2005, 11:17 PM
Trying to do some homework and my brain is fried. Am I even close here?

There are 8 different statistics books, 6 different geometry books, and 3
different trigonometry books. A student must select one book of each type.
How many different ways can this be done?

Is the answer 8/17 * 6/16 * 3/15
Sooga
09-21-2005, 11:19 PM
when you do math problems like this, you should ask yourself when you get your answer, 'does this make sense?'

How can you get a fractional number of ways to do something?
09-21-2005, 11:21 PM
8 * 6 * 3

wtf were you dividing by?
coopersmydog
09-21-2005, 11:23 PM
I came up with 144 the first time I did it. But since they can only choose one of each book I thought it was wrong. For instance isn't 2 statistics books and 1 geometry book one of the possibilities of the 144? That isn't 1 of each book.
Josh W
09-21-2005, 11:23 PM
You must be a math teacher.
bravos1
09-21-2005, 11:26 PM
try the Science, Math, Philosophy forum.. you'll get much better answers
coopersmydog
09-21-2005, 11:34 PM
[ QUOTE ]
try the Science, Math, Philosophy forum.. you'll get much better answers

[/ QUOTE ]

I just posted it there, thanks.
istewart
09-21-2005, 11:40 PM
[ QUOTE ]
when you do math problems like this, you should ask yourself when you get your answer, 'does this make sense?'

How can you get a fractional number of ways to do something?

[/ QUOTE ]

Hahaha.
coopersmydog
09-21-2005, 11:44 PM
[ QUOTE ]


How can you get a fractional number of ways to do something?

[/ QUOTE ]

True, I'm an idiot. Need to stop drinking spotted cow and doing homework.
09-21-2005, 11:44 PM
[ QUOTE ]
[ QUOTE ]
when you do math problems like this, you should ask yourself when you get your answer, 'does this make sense?'

How can you get a fractional number of ways to do something?

[/ QUOTE ]

Hahaha.

[/ QUOTE ]
closer2313
09-21-2005, 11:45 PM
144
Thythe
09-22-2005, 12:01 AM
it's 144, trust them.
Sephus
09-22-2005, 12:45 AM
there are ten different 1st digits (0-9), ten different 2nd digits, and ten different 3rd digits. how many different combinations of digits are there if you must select one of each group of digits to make a 3 digit number?

i counted to 156 from 000 when i got tired of counting. i'll never make it to 999 and find out the answer.
DasLeben
09-22-2005, 01:21 AM
[ QUOTE ]
when you do math problems like this, you should ask yourself when you get your answer, 'does this make sense?'

[/ QUOTE ]

I prefer "TLAR." "That Looks About Right." Good for flying aircraft, good for math. /images/graemlins/tongue.gif
TaoTe
09-22-2005, 01:23 AM
I choose not to reply to this post.
tonypaladino
09-22-2005, 01:28 AM
[ QUOTE ]
144

[/ QUOTE ]
Brainwalter
09-22-2005, 01:34 AM
[ QUOTE ]
I came up with 144 the first time I did it. But since they can only choose one of each book I thought it was wrong. For instance isn't 2 statistics books and 1 geometry book one of the possibilities of the 144?

[/ QUOTE ]

No, it's not.
09-22-2005, 01:44 AM
Suppose I have 1 book A and 1 book B. How many combinations are there if I select 1 of each type?
1 * 1 = 1

Suppose I have 2 Book A and 2 book B. How many combos, once again selecting 1 of each?
2 * 2 = 4

Thats how you do these sorts of problems.
What are they teaching you guys in school nowadays, anyways?