chetan2u wrote:
Is ab+c an odd integer, if a, b and c are positive integers?
(1) c is odd.
(2) Only one of the integers is even
New question
a,b,c > 0
Is (ab + c) - odd ?
If ab - odd & c - even, then (ab + c) - odd
If ab - even & c - odd, then (ab + c) - odd
If ab - odd, then a - odd & b - odd
If ab - even, then a or b or both - even
Statement 1: c is odd
ab can be odd or even & hence (ab + c) can be even or odd.
Statement 1 alone is Not Sufficient.
Statement 2: Only one of a, b, c is even
If c - even, then ab - odd, hence (ab + c) - odd
If b - even, then ab - even & c - odd, hence (ab + c) - odd
If a - even, then ab - even & c - odd, hence (ab + c) - odd
Statement 2 is Sufficient.
Answer B.
Thanks,
GyM
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