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How this can be C...i went for E...
(1)-> at least one no is negative... => -1,1,3,5=> Sum=8
-3,-1,1,3=> Sum=0...Insufficient..
(2)-> at least one no is positive...=> -5,-3,-1,1=> sum=-8
-3,-1,1,3=>Sum = 0.. insufficient..
combine..
we still have above cases valid...so how can it b C...
@genius..pls explain..
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