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Question

r × nCrnCr1 When n = 1000 and r = 500


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Solution

nCrnCr1 = nr+1r

⇒ r nCrnCr1 = n - r + 1

Put n = 1000 and r = 500,

⇒ n - r + 1 = 1000 - 500 + 1

= 501


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