2 Answers

AJPerez · Answer 1 · 2020-08-13T15:33:34+0000

Answer:

C (20, 3) = 1140

Explanation:

We are given that there is chorus of 20 singers and we are to find the number of different trios that can be selected from 20 singers.

This is a problem of combinations where the order of trios is not important.

$C ( 2 0 , 3 ) = \frac { ( 2 0 ! ) } { ( ( 2 0 - 3 ) ! 3 ! ) }$

$C ( 2 0 , 3 ) = \frac { 2 0 ! } { ( 1 7 ! ) ( 3 ! ) }$

C ( 2 0 , 3 ) = (( 2 0 * 1 9 * 1 8 ))/(( 3 * 2 * 1 ))

C (20, 3) = 1140

Please log in or register to add a comment.