igidr sample questions

[anon_econ]

http://www.igidr.ac.in/images/stories/sampleque.pdf
i have a problem in test II (test of mathematics). What on earth do we mean by 2^A where A is a SET??

[Amit Goyal]

2^A is the notation for set of all subsets of A.
For example: If A = {1, 2}
2^A = {∅,{1},{2},{1,2}}

[anon_econ]

I see. Thank u sir!