Difference of two whole number is not always a whole number.
For any two whole numbers a & b, a - b = whole number only when a is greater than or equal to b.
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Wrong!
Even if a is less than b, the difference is still a whole number. Whole numbers can be negative.
So the correct answer to the question is "YES".
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Yes, the difference between two even numbers is always an even number.
Yes, it is.
The different between two different odd numbers are always an even number
Yes, the difference of two whole numbers is always a whole number.
The question cannot be answered because it is nonsensical. The difference between two rational numbers is very very rarely a whole number.