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Problem 4 (due Monday, March 30)
Let p>2 be an odd prime number. Integers a1,a2,…,ap+1 in the interval [0,p] have the following property: for every permutation π of the set {1,2,…,p+1} the number p+1∑k=1kaπ(k) is not divisible by p. Prove that a1=a2=…=ap+1.
Ashton Keith, a freshman majoring in math, is the only person who solved the problem. His solution is based on a different idea than our solution. Both solutions are discussed in the following link Solution