Theory of Intelligence
11TH•Mathematics•Permutations And Combinations•Question 3

(ii)

Find the values of $n$ and $r$, when

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(ii)

n−1Cr−1:nCr:nCr=1:3:7{}^{n-1}C_{r-1} : {}^nC_r : {}^nC_r = 1 : 3 : 7

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