# Thread: A tricky ds_explanations r appreciated@@

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## A tricky ds_explanations r appreciated@@

If M=2, is N = 2 ?
1. M+N =2
2. M^2+N^2 =2

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again wrong question !!!!! forget the manhattan's stuffs dude .

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1. M=2 and M+N=2 implies N=0. [sufficient to determine if N=2]

2. 2^2 + N^2 = 2 implies N^2 = -2 implies N = 2i (complex) [sufficient to determine if N=2]

So both statements alone are sufficient.

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humm is this question right? mm

M =2, does n =2?

1. M+N = 2 which means 2+N=2, which means N=0 SUFFICIENT

2. M^2+N^2 = 2
humm this means 4+n^2 = 2
which is N^2 = -2 ???... I'm guessing this is SUFFICIENT simply because n cannot be 2.

So D?

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A is sufficient enough .
In B ,N^2 = -2 ,that means N is an imaginary number and cannot be equal to 2 .Hence sufficient enough.

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the question seems to be ambigiuos.

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Imo D

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