JEE Delight: (Reversing technique) if summation (-1)^k(2nCk)^2=A find summation (-1)^k(k-2n)(2nCk)^2

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JEE Delight: (Reversing technique) if summation (-1)^k(2nCk)^2=A find summation (-1)^k(k-2n)(2nCk)^2 Support the channel:
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