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Source: — Data Sufficiency |
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by Frankenstein » Sun Jun 19, 2011 8:06 pm
Hi,
3x+5 < x+11
So, 2x < 6 => x<3
As x and y are positive integers, x=1 or 2
From(1):
sum of x and y is even.
if y is odd, x=1
if y is even, x=2
Not sufficient
From(2):
product of x and y is odd. So, x and y are both odd.
So, x=1 which is not prime
Sufficient

Hence, B
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by amit2k9 » Sun Jun 19, 2011 10:45 pm
x<3 means x can be either 1 or 2.

a y can be 3,5 or 4,6 with x 1,2. not sufficient.

b x cannot be 2. thus B it is.
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