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

Question

Mathematics

Jamir Melendez

12 February, 05:55

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

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Lizeth Elliott · Answer 1

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.