If ' $a$ ' and ' $b$ ' are whole numbers, then $a - b$ is

A whole number

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A natural number

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A negative integer

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None of the above

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Solution

The correct option is D None of the above
If $a$ and $b$ are whole numbers, then there may be the following 3 cases:
Case 1: When $a > b$
Then, $a - b \Rightarrow$ Whole / Natural number
Case 2: When $a < b$
Then, $a - b \Rightarrow$ Integer
Case 2: When $a = 0$ and $b = 0$
Then, $a - b \Rightarrow$ Whole number.

Hence, option D is correct.

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If 'a' and 'b' are whole numbers, then a−b is

The correct option is D None of the aboveIf a and b are whole numbers, then there may be the following 3 cases:Case 1: When a>bThen, a−b⇒ Whole / Natural number Case 2: When a<bThen, a−b⇒ Integer Case 2: When a=0 and b=0Then, a−b⇒ Whole number.Hence, option D is correct.

If ' $a$ ' and ' $b$ ' are whole numbers, then $a - b$ is