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K. 467. Let $\displaystyle p$ denote a prime number greater than 3 and less than 1000. What are the chances that $\displaystyle p−1$ or $\displaystyle p+1$ is divisible by 6?

(6 points)

This problem is for grade 9 students only.

Deadline expired on 12 October 2015.

Statistics on problem K. 467.
 143 students sent a solution. 6 points: 78 students. 5 points: 22 students. 4 points: 4 students. 3 points: 4 students. 2 points: 6 students. 1 point: 17 students. 0 point: 11 students. Unfair, not evaluated: 1 solution.

• Problems in Mathematics of KöMaL, September 2015

•  Támogatóink: Morgan Stanley