If C (n, r-1) = 10, C (n,r) = 10 and C(n, r+1) = 5, then r is equal to?
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C (n, r-1) = 10, C (n,r)
hence r-1=n-r
⇒r=(n+1)/2
hence r-1=n-r
⇒r=(n+1)/2
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