If n and k are integers whose product is 400, which of the following statements must be true?
(A) n + k > 0
(B) n≠k
(C) Either n or k is a multiple of 10.
(D) If n is even, then k is odd.
(E) If n is odd, then k is even.
Ans is E
But I am not sure how to test different values to make sure what really holds true. I got confused, any ideas?
(A) n + k > 0
(B) n≠k
(C) Either n or k is a multiple of 10.
(D) If n is even, then k is odd.
(E) If n is odd, then k is even.
Ans is E
But I am not sure how to test different values to make sure what really holds true. I got confused, any ideas?
AA
