Question
from a group of six people two individuals are to be selected at random. How many possible selections are there?
Answers
Reiny
"Selection" usually implies that the order does not matter, so
we have the number of ways of choosind 2 from 6
or C(6,2)
= 15
or
6x5 if we worry about order.
But we have to divide by 2 to eliminate all doubles of the kind AB and BA.
so 5x6/2 = 15
we have the number of ways of choosind 2 from 6
or C(6,2)
= 15
or
6x5 if we worry about order.
But we have to divide by 2 to eliminate all doubles of the kind AB and BA.
so 5x6/2 = 15