Triti wrote:
Carcass wrote:
a−b even --> either both even or both odd
ab even --> either both even or a is even and b is odd.
As both statements are true --> a and b must be even.
As ab is an even integer --> a must be multiple of 4.
Options A is always even.
Options B can be even or odd.
Options C can be even or odd.
Options D: a+22=a2+1, as a is multiple of 4, a2 is even integer --> even+1=odd. Hence option D is always odd.
Options E can be even, odd.
Answer: D.
Hope this helps. The answer is one and only.
Regards
what if a=12 and b=4?
then a/b will not be even. plz explain. thanks in advance
Here in the question it is give a/b is even and a-b is even.
So both a and b should be even and also 'a' can be only multiple of 4.
'b' can be only those numbers where the ratio remains even.
so if you consider a=12, b can be = 2, 6 only.