The number of terms in the expansion of (a + b)^20 is:
Correct answer: C. 21
- A. 18
- B. 20
- C. 21
- D. 19
Explanation
In the expansion of (a + b)^n, the number of terms is n+1.This is because the index r in the general term (n choose r) a^(n-r) b^r ranges from 0 to n.So, the number of terms in the expansion of (a + b)^20 is:20 + 1 = 21
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