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If p+q = 1 then Σ r. nCr pr qn-r , r ∈ [r = 0, n] is equal to

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If p+q = 1 then Σ r. nCr pr qn-r , r ∈ [r = 0, n]  is equal to

(a) 1 

(b) np 

(c) npq 

(d) 0

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1 Answer

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Correct option: (a) 1

Explanation:

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