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If 1/sqrt(2x+1) {(1+sqrt(2x+1))^n-(1-sqr...

If `1/sqrt(2x+1) {(1+sqrt(2x+1))^n-(1-sqrt(2x+1))^n} = a_0+a_1x+a_2x^2+........+a_10x^10` then `n` must be equal to (A) 20,21 (B)21,22 (C)22,23 (D)none of these

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