Question

Which expression represents the number of possible combinations of n items taken r at a time?

Answer 1

`^nC_r=(n!)/(r!(n-r)!)`

Explanation:

Given :Total items = n

Items taken at a time = r

To Find: Which expression represents the number of possible combinations of n items taken r at a time?

Solution:

We will use combination over here.

`^nC_r=(n!)/(r!(n-r)!)`

Now Total items = n

Items taken at a time = r

Thus expression represents the number of possible combinations of n items taken r at a time is
`^nC_r=(n!)/(r!(n-r)!)`