Problem K. 467. (September 2015)

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 pont)

Deadline expired on October 12, 2015.

Statistics:

142 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.

Problems in Mathematics of KöMaL, September 2015