Consider the four statements (a) 3r ER Vy ER (b) Vr ER By R (c) VER Vy ER (d) 3r ER Vy ER 1. Are the statements a, b, c, d true or false? 2. Find their negations. x+y>0; x+y>0; x+y>0; y² > r.

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