UGC NET Paper 1 GA 2013 June Solved Paper

Odd number from 1 to 45 which are exactly divisible by 3 are following.
3, 9, 15, 21,....., 45
This is an arthmetic series with first term a = 3, and common difference d = 6
Sixth term of this series
${\mathit{t}}_6=\mathit{a}+\left(6-1\right).\mathit{d}$ $=3+5\times 6=33$.