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If c 0 +c 1 +c 2 +.........+c n =256,then 2n c 2 is equal to A... 56 B...120 C...28 D...91
we know that c0+c1+c2+.........+cn= 2^nso, 2^n=256=2^8or n=8so, 2nc2 = 16C2= 120, so option B is correct
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