Question

From an A.P., the first and the last terms are 13 and 216 respectively. Common difference is 7. How many terms are there in that A.P.? Find the sum of all the terms.

Answer 1

Let there be n number of terms.

Given, a = 13, t_n = 216, d = 7

\(\therefore\) The number of terms in the A.P. is 30 and the sum of all 30 terms is 3435.