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If n+1 Cr+1 : n Cr = 11 : 6 and n Cr : n–1 Cr–1 = 6 : 3, find n and r.

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If n+1Cr+1 : nCr = 11 : 6 and nCr : n–1Cr–1 = 6 : 3, find n and r.

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To Find : n & r

We use this property in this question:

n =10 & r = 5

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