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Let fk=(1+2+3+...+k)/k Also is f1^2+f2^2...

Let `f_k=(1+2+3+...+k)/k` Also is `f_1^2+f_2^2+f_3^2+...+f_10^2=5/12N`, then the value of `N` will be (A) `283` (B) `303` (C) `505` (D) `50`

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