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For every pair of natural number n and m...

For every pair of natural number n and m, to which of the following sets must n + m belong?
I. The natural numbers
II. The intergers
III. The rational numbers
IV. The real numbers
V. The complex numbers

A

I,II and III only

B

II, III and IV only

C

III, IV and V only

D

I,II,III,IV and V

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The correct Answer is:
D
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