Determine the number of terms in the A.P. 3,7,11,…,399. Also find its 20th term from the end.

Determine the number of terms in the A.P. 3,4,5, …, 399 . Also find its 25^(th) term .

Determine the number of terms in the terms in the A.P.3,7,11407. Also,find its 20 th term from the end.

20th term of the A.P. 2 , 7, 12,………. is :

If the nth term of an A.P. is (3-7n), find its 10th term.

The sum of n terms of an A.P. is n^(2) + 3n . Find its 20th term.

(i) Find the 10th term from the end of the A.P. 82, 79, 76, .... , 4 (ii) Find the 16th term from the end of the A.P. 3, 6, 9, .... 99

Write 5th term from the end of the A.P.3,5,7,9,*201.

Find the 8th term from the end of the AP 7,9,11,…, 201

The sum of first n terms of an A.P. is 5n^(2) + 3n . If the nth term is 168, find the value of n. Also find the 20th term of the A.P.

If sum of n terms in an A.P is ((5n^2)/2+(3n)/2) then find its 20th term