Question

Use Pascal’s Triangle to determine the probability that you will get zero red lights (order does not matter) when looking at a row of five lights. Assume red and green are equally likely occurrences.

Answer 1

how does pascal's triangle help here? i must be confused

Answer 2

Do you know Pascal's Triangle?

Answer 3

Pascal's triangle gives the coefficients of the binomial expansion, also known as nCk. Here, of course, we're after the first term, where the coefficient equals 1.