(−3)×3=(−12)−(−3)
Let R={(3, 3), (6, 6), (9, 9), (12, 12), (6, 12), (3, 9), (3, 12), (3, 6)}
be a relation on the set A={3, 6, 9, 12}. The relation is
13+23+33+....+12312+22+32+....+122=