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If \(x\) and \(y\) are distinct positive integers and \(x+y\) is even, what is the remainder when \((x+y)^a\) is divided by \(10,\) where \(a\) is a positive integer?
(1) Units digit of \(y\) is \(6.\)
(2) \((xy)^a\) is divisible by \(10.\)
Answer: C
Source: e-GMAT
(1) Units digit of \(y\) is \(6.\)
(2) \((xy)^a\) is divisible by \(10.\)
Answer: C
Source: e-GMAT
