The 8^ common term of the series gathered S_1=3+7+11+15+19+ ..

Question

The ${8}^{}$ common term of the series

$\begin{gathered} {S}_{1}=3+7+11+15+19+\ldots .. \ {S}_{2}=1+6+11+16+21+\ldots .. \end{gathered}$

is :

Answer: 151

Accepted Answer

First common term is 11

Common difference of series of common terms is LCM (4, 5) = 20

${a}_{8}=a+7d$

$=11+7	imes 20=151$

Solutions · 1