The answer to exercise marked [BB] can be found in the Back of the Book.
Find a + b (mod n), ab (mod n)and (a + b)2(mod n)in each of the following situations:
(a) a = 4003, b = −127, n = 85
(b) a = 17.891, b = 14.485,n = 143
(c) a = −389,221, b = 123,450, n = 10,000
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