# 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(1603)   (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