Find the sum of 23 terms of the AP 5,9,13,17,……

Find the sum of 23 terms of the AP 17,12,7,2,-3,….

Find the sum to 25 terms of the A.P. 5, 7, 9, 11, …

Find the sum to 25 terms of the A.P. 5, 7, 9, 11, …

Find the sum of n terms of the AP 6,13,20.....

Find the number of terms of the A.P.9,17,25,... whose sum is 636

Find the 23rd term of the A.P, 9,4,-1,-6,…

Find: (i) the 20th term of the AP 9, 13, 17, 21, … (ii) the 35 th term of the AP 20, 17, 14, 11,… (iii) the 18th term of the AP sqrt(2), sqrt(18), sqrt(50), sqrt(98),… (iv) the 9th term of the AP (3)/(4), (5)/(4), (7)/(4), (9)/(4),.... (v) the 15th term of the AP -40, -15, 10, 35,....

Which term of the AP 5, 9, 13, 17, … is 81?

If the sum to n terms of the A.P.-9,-1,7, ... is 2175, find n.

Find the sum of the AP 13,15,17…..99: