number properties

[smallsorrow]

If n and k are integers whose roduct is 400, which of the following statements must be true?
A) n+k>0
B) n unequal k
C) Either n or k is a mltiple of 10
D) If n is even, then k is odd
E) If n is odd, then k is even

OA follows

[schumi_gmat]

Ans E

[EricLien9122]

A)
n=-20, k=-20

B)

n=20, k=20

C)

n=8, k=25

D)

n=50, k=4

E) Correct choice.

n=25, k=8
n=5, k=80


Please share your thoughts.

[mental]

was there a choice NONE of the above?

[mental]

I AM UNABLE TO UNDERSTAND THE DIFFERENCE BETWEEN OPTION D AND E.
JUST THAT THEY HAVE CHANGED THE VARIABLE
to me it means that if one is odd, than other is even???

can someone explain pls

[gmat009]

I AM UNABLE TO UNDERSTAND THE DIFFERENCE BETWEEN OPTION D AND E.
JUST THAT THEY HAVE CHANGED THE VARIABLE
to me it means that if one is odd, than other is even???

can someone explain pls

D) If n is even, then k is odd
E) If n is odd, then k is even

D says when n is even, then k is odd.
Let's assume n=20 or any other even number then k can be any even or odd.

E says when n is odd, then k is even
If n is odd, then K has to be even becoz odd*odd=odd. You can never get 400 result.

Hope that helps.......

[mental]

Thanks

I was reading too much from D
and had taken both the meanings of D and E included in D