Find the sum of the first 25 terms of each of the arithmetic sequences below.
i) 11,22,33,…….
ii) 12,23,34,……...
iii) 21,32,43,…….
iv) 19,28,37,………
v) 1,6,11,…….

The sum of the first and 21^(th) terms of an arithmetic sequence is 140.What is the 11^(th) term?

Find the sum of first 11 terms of the sequence 20,25,30.......

Calculate the difference between the sum of the first 20 terms of the arithmetic sequences 6,10,14,….. and 15,19,23,…….

Find the sum of 32 terms of an AP whose third term is 1 and the 6^th term is -11.

Write the first three terms of each of the arithmetic sequences described below: i) First term 30, the sum of the first three terms is 300 ii) First term 30, the sum of the first.four terms is 300 iii) First term 30 , the sum of the, first five terms is 300 iv) First term 30 , the sum of the first six terms is 300

Calculate in head, the sums of the following' arithmetic sequences. i) 51+52+53+ ...+70 ii) 1 1/2+ 2 1/2 +…..12 1/2 iii)1/2+1+1 1/2+ 2 +2 1/2+…..+12 1/2

The sum of the first and 21^(th) terms of an arithmetic sequence is 140.Calculate the sum of first 11 terms of this sequence,if the first term is 10.

If 3/2, 5/3, 11/6 are the first three terms of an arithmetic sequence, find the first integer term in this sequence.