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somehow I have less problem with the math and more with the sufficient /not sufficient concept. But thanks. The more problems I look at the more it makes sense. (still easier to see that with the explanation)
easy one this time s<20 so N could be 2 to 5 (N greater than 5 will exceed the limit s<20) this condition alone not sufficient. statement B - S^2 > 220 N clould be 5,6,7,8 anything equal or greater than 5 hence not sufficient. combining the two , we get N=5 which is the answer hence C
Re: If S is the sum of the first n positive integers, what is [#permalink]
06 Feb 2014, 02:28
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