1. Negate the following statements. As usual, push the negation as far into the statements as possible. (a)
p→(q∧r). (b) Everybody needs somebody. 5. Use proof by cases to show that ∣x∣+1≥∣x+1∣. 6. Use rules of inference to showP,(P∨Q)→R, and Rˉ ∨ Qimply Q