Prove the following:
(a) If 7 | a3 + b3 + c3, then 7 | a or 7 | b or 7 | c.
(b) 9 | (n − 1)3 + n3 + (n + 1)3 for all n ≥ 1.
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.