Question

a and b are any two whole numbers. Φ is an operation such that a Φ b is DEFINITELY a whole number.
Which of the following could be the operation Φ?

Answer 1

Answer:

If a and b are whole numbers, then there may be the following 3 cases:

Case 1: When a>b

Then, a−b⇒ Whole / Natural number

Case 2: When a<b

Then, a−b⇒ Integer

Case 2: When a=0 and b=0

Then, a−b⇒ Whole number.