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)(m² + n²)^–1]
3. mn / (m² + n²)
Select the correct answer using the code given below.
1 and 2
2 only
2 and 3
3 only
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Which among the following events happened earliest ?
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An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
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