Question

How do you use Pascal's triangle to calculate the binomial coefficient of `((9), (4))`?

Answer 1

126

Explanation:

Pascal's triangle row and column numbering starts at 0, so for `(\frac{9}{4})` find the tenth row, fifth column, which is 126. You can check this with a calculator: `9C4 = \frac{9!}{4!*5!} = 126`.