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A for me

1) one is even so total is even. Just to remind everybody that in case of 0 it's still ok because 0 is an even number. suff

2) B-A=C-B
so 2B=A+C

at this time let's analyze each part : 2B is an even number because it is 2*B and 2 is an even number so 2B is an even number in any case.
So we know that A+C is an even number, only 2 possible cases :
- A and C are even
- A and C are odd

If A and C are even, no problem , it is sure that A*C*B=even
If A and C are odd, we are not sure that A*C*B will be even..
it can be 11,3,7 so that 2*7=11+3 but 7*11*3 will give and odd number so insuff
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