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

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

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