Answers

2015-03-18T18:37:54+05:30
(15 - 1) + (13 - 3) + (11 - 5) = 30
0
3! + 11 + 13
It is.
3+11+13=27 not 30
i think you are in 7-8 standard and not aware about factorial do you?
Yup!