Problem A. 578. (January 2013)
A. 578. For every integer n2 let P(n) be the product of all expressions of the form where the signs of the terms are chosen arbitrarily.
(a) Prove that P(n) is a positive integer.
(b) Prove that for all >0 there exists an n_{0} such that for every n>n_{0} the largest prime divisor of P(n) is smaller than .
(5 pont)
Deadline expired on February 11, 2013.
Statistics:
10 students sent a solution.  
3 points:  2 students. 
1 point:  8 students. 
