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.

Mathematics 2017 NDA Mathematics 2017 NDA 2017

Options