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Source: — Data Sufficiency |
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by pemdas » Fri May 06, 2011 9:44 am
the question can be rephrased is x + y even?
st(1) x + z is even -Not Sufficient, as y is unknown and y could be odd or even
st(2) y + z is even -Not Sufficient, as x is unknown and x could be odd or even
combined st(1&2) x+y+2z is even Sufficient

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