Question

Subtraction and division are not binary operation on.

Options

• N

• R

• I

• All of these

Answer 1

N

Explanation:

N × N → N, given by (a, b) → a – b, is not binary operation, as the image of (3, 5) under '–' is 3 – 5 = – 2 ∈ N.

Similarly ÷: N × N → N given by (a, b) → a + b is not a binary operation, as the image of (3, 5) under ÷ is 3 + 5 = `3/5` ∉ N.