The number of scalene triangles having all sides of integral lengths, and perimeter less than 13 is:
<spanclass=′latex−bold′>(A)</span> 1<spanclass=′latex−bold′>(B)</span> 2<spanclass=′latex−bold′>(C)</span> 3<spanclass=′latex−bold′>(D)</span> 4<spanclass=′latex−bold′>(E)</span> 18 calculusintegrationgeometryperimeterinequalities