The first and the last terms of an AP are 17 and 350 respectively. If the common differenceis 9

We have; a = 17, a_n = 350 and d = 9

We know;

a_n = a + (n – 1)d

350 = 17 + (n – 1)9

(n – 1)9 = 350 – 17

n – 1 = 333/9 = 37

n = 38

Now, sum can be calculated as follows:

                 = 19*367

                 = 6973