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Source: — Data Sufficiency |
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by thephoenix » Sun Apr 11, 2010 5:31 am
if we see the sequence it will be

1,-1,3,-3,5,-5,7,-7,9,-9......and so on
s1)now for n a odd no. the sum is always +ve hence suff

s2) for An a +ve No. n is always odd and as proved abve the sum is always +ve hencde suff
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