Question: Let n Z+ with n > 1, and let A be the set of positive integer divisors of n. Define the relation R on

Let n ∈ Z+ with n > 1, and let A be the set of positive integer divisors of n. Define the relation R on A by x R y if x (exactly) divides y. Determine how many ordered pairs are in the relation R when n is
(a) 10;
(b) 20;
(c) 40;
(d) 200;
(e) 210; and
(f) 13860.

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