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यदि .^(n)C(r-1)=36,^(n)C(r) = 84"और" ^(n...

यदि `.^(n)C_(r-1)=36,^(n)C_(r) = 84"और" ^(n)C_(r+1)=126,"तो "^(r)C_(2)` का मान ज्ञात कीजिए ।

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