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. What is∑ 28 k=0 k^2(28Ck), where 28Ck is the number of ways of choosing k items from 28 items?

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406*2^27 will b the ans.. :)
11 years agoHelpfull: Yes(8) No(6)

@Ragini...could you plz explain..???
11 years agoHelpfull: Yes(1) No(2)

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