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3 causes 7 (Posted on 2012-03-10) Difficulty: 2 of 5
Show that if a*n^2 + b*n + c (a, b, and c are integers)is divisible by seven for three consecutive integers, then it is divisible by seven for all integers.

See The Solution Submitted by Ady TZIDON    
Rating: 4.0000 (1 votes)

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Hints/Tips my error in the officially published solution Comment 2 of 2 |

Mea maxima culpa- errare humanum est.

II is BROLL'S, not BRACTAL'S solution

  Posted by Ady TZIDON on 2012-04-21 03:06:25
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