medium · GMAT Quant
Let m,n,k be nonzero integers with m n^3 k^2<0, mnkequiv 1pmod2, and m^2+n^2+k^2equiv 3pmod8.
Which statement must be true?
- m^2 n^2 k^2 equiv 1 pmod8
- m n > 0
- m + n + k is an even integer.
- m, n, and k are all even integers.
- m n k > 0
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