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The middle term in the expansion of (a – x)^n is (A) 56a^3 x^5

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The middle term in the expansion of (a – x)n is

(A) 56a3 x5

(B) -56a3 x5

(C) 70a4 x4

(D) -70a4 x4

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Answer is (C) 70a4 x4

If n is even in (a + b)n, then its middle term

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