Needs to be solved

(a) What does it mean to say that the integer d is a divisor of the integer n (written d|n)? [2131:] (b) Let d, as, y be any integers. Write out a complete proof of the following state- ment (S): If d is a divisor of a: and of y then d2 is a divisor of my. [6131:] (C) Write down the converse of the statement S. Is it always true? Justify your answer. [6W5] ((1) Write down the contrapositive of the statement S. Is it always true? Justify your answer. [6pt]