if x and y are integers, is the value of x(y+1) even?
1)x and y are prime
2)y>7
please discuss.
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x and y are integers
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sameerballani
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Frankenstein
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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
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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