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Question

If the coefficient of the middle term in the expansion of (1+x)2n+2 is α and the coefficients of middle terms in the expansion of (1+x)2n+1 are β and γ, then relation between α,β and γ is-

A
α+β+γ=0
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B
α=β+γ
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C
β=α+γ
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D
γ=β+α
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