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PostPosted: Fri Nov 06, 2009 7:54 pm 
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Location: Chennai, India
When Y is divided by 2, is the remainder 1?

1. (-1)^(Y+2) = -1
2. Y is prime


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PostPosted: Sat Nov 21, 2009 1:02 pm 
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Joined: Fri Feb 02, 2007 5:37 am
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The only time 1. (-1)^(Y+2) = -1 will be true when Y+2 is odd and Y should be odd too. Y can be 1 and in that case remainder is not 1 hence statement 1 is not sufficient. Statement 2 mentions that Y is prime. If Y is 2 then answer is no but if Y is 3 then yes. Hence, statement alone is not sufficient either. But if taken together we know that Y cannot be 1 or 2 hence Y>2. Say Y is 3 or 5 the remainder is 1.

So 1&2 together is sufficient.


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