What are the coefficients for the binomial expansion of open paren A plus b close paren cubed ?

For a binomial raised to the third power, the coefficients come from the third row of Pascal’s triangle: 1, 3, 3, 1. Thus (A + b)³ expands as A³ + 3A²b + 3Ab² + b³, so the correct choice is “1, 3, 3, 1.”

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