Question

Use Pascal's Triangle to find (9 3). Someone help me please I don't have whatever that is.

Answer 1

$\displaystyle \binom{n}{k}$ is equal to the $(k+1)$th number in the $(n+1)$th line in Pascal's triangle.

So, $\displaystyle \binom{9}{3}$ is equal to the 4th number in the 10th line in Pascal's triangle, which is 84.