Question

Let * be a binary operation on N given by a * b = HCF (a, b), a, b ∈ N. Write the value of 22 * 4.

Answer 1

Given: a * b = HCF (a, b)
Here,
22 * 4 = HCF (22, 4)
                    = 2                                [because highest common factor of 22 and 4 is 2]