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Average. (42+43)/2 = 42.5 Come on.
42 is composite, 43 is prime.
21 with 1 remaining 43 - 1 = 42 = 2 x 21
There are infinitely many pairs of positive integers that satisfy the equation x - y = 42, starting with (43, 1), (44, 2), (45, 3) and so on.
43 + 42 = 64 + 16 = 80