Solve the problem.
-In how many ways can a class president and a class secretary be chosen from a group of 10 candidates?
A) 720
B) 90
C) 20
D) 19

Question

Quizplus · Accepted Answer

The number of ways to choose a class president and a class secretary from 10 candidates is calculated using permutations since the order in which they are chosen matters. The formula for permutations is nPr = n! / (n-r)!, where n is the total number of items, and r is the number of items to choose. Here, n=10 (total candidates) and r=2 (positions to fill), so the calculation is 10P2 = 10! / (10-2)! = 10! / 8! = 10 x 9 = 90.

Solve the Problem. -In How Many Ways Can a Class President and a President