For the Arithmetic Sequence $a_{1}, a_{2}, \ldots, a_{n}$ , Suppose $a_{1}=1, a_{2}=2$

Short Answer

For the arithmetic sequence $a_{1}, a_{2}, \ldots, a_{n}$ , suppose $a_{1}=1, a_{2}=2$ , and the partial sum $S_{1}=1$ . What is $S_{6}$ ?