Tuesday

July 29, 2014

July 29, 2014

Posted by **ashly** on Wednesday, April 14, 2010 at 7:33pm.

- math could you please help i don't understand -
**Damon**, Wednesday, April 14, 2010 at 7:42pmthere are 5 skaters sitting in a penalty box.

A B C D E

You pull one out at random.

Say it is C and our chance is 1/5 for picking C

NOW WE HAVE 4

A B D E

Say it is A and our chance is 1/4 for picking A ( NOT 1/5 !!!!)

Next we pick B (1/3)

Next D (1/2)

Next E (1/1 or 1)

SO

our chances of picking that order are

(1/5)(1/4)(1/3)(1/2)(1/1)

or

1/5!

SO

and the number of possible orders is

5! = 120

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