What are the coefficients for the binomial expansion of (a + b)3?

For a binomial raised to the third power, the coefficients are the entries in the third row of Pascal’s triangle: 1, 3, 3, 1. Thus (a + b)³ expands to a³ + 3a²b + 3ab² + b³, so the coefficients are 1, 3, 3, 1.

AI-written and checked against the verified answer.