In certain areas, such as probability or expanding a binomial expression, one needs to calculate the combination of n things taken k at a time, , denoted by a variety of notations, including

C(n,k) nCr

This item calculates the number of different ways that k objects can be selected from a set of n objects. For example, in how may ways can we select 5 items from a set of 8 items. The answer is determined by calculating C(8,5). The item nCr( is found in the MATH menu.

Press MATH to access the MATH menu,
press to select 7:Probabaility,
press to select 3:nCr,
press to calculate C(8,5).

We then observe that C(8,5) = 56.