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यदि .^(n+1)C(r+1) : .^(n)C(r) : ^(n-1)C(...

यदि `.^(n+1)C_(r+1) : .^(n)C_(r) : ^(n-1)C_(r-1) = 11 : 6 : 3 `, तो n और r के मान ज्ञात कीजिए ।

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