A\((ab)^2\). The square power of an odd integer is always an odd integer. For example: \(21^2 = 441\)
b) \(a^2 - b^2\). \(a^2\) is an even integer and \(b^2\) is an odd integer. The difference between both numbers is and odd integer.
c) The product of an even integer (2a) and an odd integer is always a even integer.
d) The product of an even integer (a) and other even integer (2b) is always a even integer.
The answer is c) and d) cases.
