Circle the following sentences which are valid (always true). If one is not always true, give an example of an assignment of values to its variables which make it false. Assume all variables are integers. • (x < 0)→ (y < 0) • (x<0)→ (x-y < 0) (x+y< 0) (x+y< 0) ● ● (x*y < 0) (x*y < 0)

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