



 
Hi Mhiko. if x ≡ 2 mod 15 then there exists some integer i such that 15i + 2 = x. thus, 15i + 2 = 25j + 1. This solves for j: j = 3i/5 + 1/25. Recall that j and i are integers. Do you see the problem? Can you explain why there is no solution? Cheers,  


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