Find the coefficient of in the expansion of .

Answer and explanation

Correct answer: C. 126

  1. Step 1: The term in is . Step 2. . Answer: 126. Why not the others: 3024: That uses permutations; the order of the terms is not counted. 36: That multiplies and . 84: That is the coefficient of .

Practise more Binomial expansion, permutations and combinations.

Free questions with an explanation for every one, and full timed Singapore GCE O-Level mock tests.

All Binomial expansion, permutations and combinations questionsTake a mock test

More Binomial expansion, permutations and combinations questions