If n is odd, then the expansion of a + x)n has _____?
- 4 middle terms
- 2 middle terms
- 3 middle terms
- None of these
Explanation
When n is odd, the binomial expansion of (a + x)^n has n + 1 terms.
Since the total number of terms is even (odd n + 1), there are 2 middle terms.
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