GATE Questions & Answers of Discrete Mathematics Computer Science and Information Technology

Which one of the following is a closed form expression for the generating function of the sequence $\style{font-family:'Times New Roman'}{\left\{a_n\right\}\;,}$ where $\style{font-family:'Times New Roman'}{a_n=2n+3}$ for all $\style{font-family:'Times New Roman'}{n=0,1,2,.....?} $
 

Subjects of Engineering Mathematics