Question

Let '*' be a binary operation on N defined by
a * b = 1.c.m. (a, b) for all a, b ∈ N
Find 2 * 4, 3 * 5, 1 * 6.

Answer 1

a * b = 1.c.m. (a, b)

2 * 4 = 1.c.m. (2, 4)
             = 4
3 * 5 = 1.c.m. (3, 5) 
         = 15
1 * 6 = 1.c.m. (1, 6)

        = 6