- If a and b are integers such that a > b > 1, which of the following cannot

be a multiple of either a or b?

(A) a – 1

(B) b + 1

(C) b – 1

(D) a + b

(E) ab

For this if I take a=3 and b=2 and a=4 and b=3 then the answer will be d but solution says it is c, like how?

B cannot be 1 as it has to be more than 1, mentioned in the question

Sorry, I missed that. Try a = 8 and b = 2. a + b = 10, which is a multiple of b.

That’s what I’m saying different numbers are giving different answers, so how can I choose the correct one

It’s *cannot* → must not. If you can find a number that works with a certain option, cross it out.

This won’t be the case for C.