rdalkobi rdalkobi

10-06-2020
Mathematics

contestada

In how many ways can a president and a vice president be randomly selected from a class of 20 students?

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morrhady morrhady

10-06-2020

Answer:

n how many ways can a president, vice president, and a secretary be chosen? It is 12X11X10. Permutation of n things taken r at a time: nPr=n!/(n-r)! 12P3=12*11*10*9!/9!= 12*11*10=1320 ways.

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