Question

if a and b are two natural numbers and if (a + b) is even prove that (a - b)is also even

Answer 1

Answer

4+2=6

4-2=2

if we perform this operation on odd then

5-3=2

5-3=8

so it means if we need an even no. then the both no should be even if you take a no even and other odd then you always got a odd no.