Precalculus (6th Edition) Blitzer

$3660$
Formula to calculate the sum of an arithmetic sequence is: $S_n=\dfrac{n}{2}(a_1+a_n)$ ...(1) Here, $a_1:$ First term and $a_n=$last term Then, our first (1) equation becomes: $S_{60}=\dfrac{60}{2}(2+120)\\=30(122)\\=3660$