Prove that the greatest value of `.^(2n)C_(r)(0 le r le 2n)` is `.^(2n)C_(n)` (for `1 le r le n)`.

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Prove that the greatest value of `.^(2n)C_(r)(0 le r le 2n)` is `.^(2n)C_(n)` (for `1 le r le n)`.
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Ye 2(n-r) +r+1 = 1+ 2 (n-r) +1 kaise ho gaya

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