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If m and n are distinct natural numbers,...

If m and n are distinct natural numbers, then which of the following is/are integer/integers?
1. `(m)/(n) +(n)/(m)`
2. `mn ((m)/(n)+(n)/(m)) (m^(2)+n^(2))^(-1)`
3. `(mn)/(m^(2)+n^(2))`
Select the correct answer using the code given below.

A

1 and 2

B

2 only

C

2 and 3

D

3 only

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