Mathematics - Sequence & Series Question with Solution | TestHub

Given ${\mathrm{S}}_n=2n+3n^2$ Now, first term $=2+3=5$ second term $=2(2)+3(4)=16$ third term $=2(3)+3(9)=33$ Now, sum given in option (b) only has the same first term and difference between 2 nd and 1 st term is double also.