Consider a triangle drawn on the XY plane with its three vertices at (41 0) (0 41) and (0 0) each

Question

Consider a triangle drawn on the X-Y plane with its three vertices at (41, 0), (0, 41) and (0, 0), each

vertex being represented by its (X, Y) coordinates. The number of points with integer coordinates inside the triangle (excluding all the points on the boundary) is :

Math