(1) 2n divisible by 4 means that n contains at least one 2 as a factor. Therefore the statement is sufficient.
(2)
odd*odd = odd
even*even = even
as n^2 is even, n must be even. Sufficient.
Answer D.
(2)
odd*odd = odd
even*even = even
as n^2 is even, n must be even. Sufficient.
Answer D.
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