## Trending News

Promoted

# Statistics?

A box contains N tags numbered from 1 to N . In how many ways can I select J of the tags?

### 1 Answer

Relevance

- Anonymous1 decade agoFavorite Answer
This is a combinatorics problem. We need to find N-choose-J (NCJ), or in other words, in how many ways can we choose J tags from a group of N. The equation for the combination function is:

NCJ = N!/[(J!)*(N - J)!]

So basically, if we don't know N or J, then the general formula is given above, or you can just use the combinations notation NCJ. N is superscripted, and J subscripted.

You could also find the number as the Jth element of the Nth row of Pascal's triangle.

Still have questions? Get your answers by asking now.