Turkish NMO First Round - 1999 P-22 (Number Theory)
Source:
July 3, 2012
Problem Statement
If m,n∈Z, then m^{2} \plus{} 3mn \minus{} 4n^{2} cannot be<spanclass=′latex−bold′>(A)</span>69<spanclass=′latex−bold′>(B)</span>76<spanclass=′latex−bold′>(C)</span>91<spanclass=′latex−bold′>(D)</span>94<spanclass=′latex−bold′>(E)</span>None