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Question

Which of the following pairs (x,y) of whole numbers, when subtracted(i.e. x - y) does not give a whole number?

A

5, 2
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B

3, 1
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C

7, 10
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D

0, 1
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Solution

The correct options are
C
7, 10
D
0, 1
Whole numbers are not closed under subtraction. So , subtraction of two whole numbers might not result in a whole number.

Whole numbers are {0,1,2,3,...}

I. 5 - 2 = 3, a whole number.
II. 7 - 10 = -3, not a whole number.
III. 3 - 1 = 2, a whole number.
IV. 0 - 1 = -1, not a whole number.

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