2 Answers
Soumyadeep Basu
·2013-06-29 09:00:57
The given expression can be rewritten as
12(1-13+12-14+13-15+....
=12(1+12) =34.
The given expression can be rewritten as
12(1-13+12-14+13-15+....
=12(1+12) =34.