Solve any maths problem

Equations, derivatives, integrals, matrices, triangles, primes, statistics, or a word problem the tutor breaks into parts.

Discrete-Math · Counting

How many ways to choose 2 from 8

8,\ 2

Step by step

  1. \binom{8}{2} = \frac{8!}{2!\,(8-2)!}

    Unordered selections: n! / (k! (n−k)!).

  2. = \frac{40320}{2 \times 720} = 28

Reveal the answer
\binom{8}{2} = 28