Binomial TheoremHard

Question

If 1 ≤ r n − 1 then ^n-1C_r + ^n-2C_r + .....+ ^rC_r equals-

Options

A.ⁿC_r

B.ⁿC_r+1

C.ⁿ⁺¹C_r

D.None of these

Solution

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