Ononot — The sum of the first n terms of an arithmetic sequence is Sn

Guest Session: 1 Question Remaining. Create Account to save progress.

Arithmetic Sequenceshard

0:00.0

The sum of the first $n$ terms of an arithmetic sequence is $S_n$ . If $S_3 = 18$ and $S_6 = 72$ , which of the following is the $n^{th}$ term $a_n$ ?