Question

Please help on this one ?

Answer 1

A

Explanation:

The expansion of (x +y)⁴ is ...

... x⁴ +4x³y +6x²y² +4xy³ +y⁴

The expansion coefficients are 1, 4, 6, 4, 1; the sum of exponents is always 4, and there are 5 terms.