If |a| denotes the absolute value of an integer, then which of the following are correct?
1. |ab| = |a||b|
2. |a+b| ≤ |a|+|b|
3. |a-b| ≥ ||a|-|b||
Select the correct answer using the code given below.
1 and 2 only
2 and 3 only
1 and 3 only
1, 2 and 3
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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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