Answers

2015-11-18T12:32:40+05:30
0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?
In above, first series is
0,1,2,3,4,5 and the other series is
0,3,6,9,12,?
0+3=3
3+3=6
6+3=9
9+3=12
hence,
12+3=15
0
2015-11-18T12:33:24+05:30
The number which follows is 15
bcoz, 

if u take the 1st no. and its alternetive no.s they are
 0,1,2,3,4,5
the 2nd no.and its alternative no.are the products of 3 and the no. before it.
0