16) Use De Morgan's laws to find the negation of the statement: "The student will have a class tomorrow or will have an exam." a) The student will have a class tomorrow and will have an exam. b) The student will have a class tomorrow and will not have an exam. c) The student will not have a class tomorrow and will not have an exam. d) The student will not have a class tomorrow or will not have an exam. 17) Using truth-tables, check the veracity of the following statement: ((r→t) V (s A-t)) A (t V r)) is equivalent to (t V (SA r)) 18) Using truth-tables, check the veracity of the following statement: ((rt) V (s A-t)) A (t Vr)) is equivalent to (t A (s^ r)) [T/F] [T/F]

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