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:
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. 
