SOLUTION: how many different ways can a researcher select three mice from 15 mice and assign them each to a different test? thank you!

SOLUTION: how many different ways can a researcher select three mice from 15 mice and assign them each to a different test? thank you!

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Question 293441: how many different ways can a researcher select three mice from 15 mice and assign them each to a different test?
thank you!
Answer by unlockmath(1688) (Show Source): You can put this solution on YOUR website!
Hello,
The formula is nPr=n!/(n-r)!
So it would look like this:
15!/(15-3)! This expands out to:
(15x14x13x12x11x10x9x8x7x6x5x4x3x2x1)/(12x11x10x9x8x7x6x5x4x3x2x1)
I'll let you do the calculations from here.
Make sense?
RJ
www.math-unlock.com
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