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1.for all integer n amd m, if n-m is even then n^3-m^3 is even 2.) for...

1.for all integer n amd m, if n-m is even then n^3-m^3 is even

2.) for all int m, ifm>2 then m^2-4 is composite
3.) for all int ab c, if a|b and b|c then a|c
prove true or give counterexample

asap plz,
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