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If an = Σ 1/nCr  r ∈ [r = 0, n] , then Σ r/nCr , ∈ [r = 0, n] equals ....

(a) (n - 1) an 

(b) n an 

(c) 1/2 n an 

(d) None of these

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Correct option: (c) 1/2 n an 


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