Updated: Question in GATE 2012 Mining Engineering Paper with Solution

A question in GATE 2012 Mining Engineering Paper with Solution has been updated:

A system consists of four elements A, B, C and D which are connected functionally in a parallel configuration. The individual reliability of the elements is 0.80, 0.82, 0.85 and 0.90 respectively. The reliability of the system is

1. 0.750
2. 0.999
3. 0.498
4. 0.602