The answer to exercise marked [BB] can be found in the Back of the Book.
Let a and b be integers. Let p be a prime. Answer true or false and explain:
(a) [BB] If p | a11, then p | a.
(b) If p | a and p | (a2+b2), then p | b.
(c) If p | (a9 + a17), then p | a.
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