CT 26: Arithmetic & Geometric Progression – III

1.If n^th term of an AP is (3n + 5) then its 20^th term is

2. The sum of the finite series 5 + 8 + 11 + ... + 47 + 50 is

3. The sum of the first 20 terms of the AP : 4, 8, 12 . . . . . is 

4. Which term of the Arithmetic Progression (A.P.) 4, 9, 14, 19, … is 109?

5. Find the sum of 23 terms of the A.P. 5, 9, 13, 17, ….

6. The sum of (p + q)^th and (p – q)^th terms of an AP is equal to

7. What is the fourth term of an AP of n terms whose sum is n(n + 1)?

8. ​Find the sum of 20 terms of an AP whose second term is 4 and fifth term is - 11?

9. Find the 6^th term of an AP, if the sum of first n terms is n2 + n

10. Which term from the end of the A.P 33, 29, 25 ........? -31 is -7?