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in Binomial theorem by (46.7k points)

If H1, H2, H3,…, H2n + 1 are in HP, then ∑ (-1)i (Hi + Hi +1/H1 - Hi + 1) is equal to

(A)  2n - 1

(B)  2n + 1

(C)  2n

(D)  2n + 2

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