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x and y are integers

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Source: — Data Sufficiency |
Legendary Member
Posts: 1448
Joined: Tue May 17, 2011 9:55 amFollowed by: 53 members
Location: India
Thanked: 375 times

by Frankenstein » Wed Jun 22, 2011 8:38 am
Hi,
From(1):
if x=2, y=3 then x(y+1) = 8 is even
if x=3, y=2 then x(y+1) = 9 (not even)
Not sufficient

From(2):
No info. about x.
Not sufficient

Both(1)&(2):
y is prime and greater than 7. So y has to be odd. So, y+1 is even
So, x(y+1) is also even
Sufficient

Hence, C
Cheers!

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