Which the following values is the sum of the AP :  3, 0, -3,  -6,  -9, .......  -27? 

Find the sum of the first 20 terms of the arithmetic series if    and   .

Find the sum of the first 40 terms of the arithmetic sequence 2, 5, 8, 11, __________ .

If a, b and c terms an AP, Which of the following will allso be an AP?

Which of the following values is the sum of the first five term of the AP 3, 10, 17 .........? 

The first term and the sum of all the terms of an AP are 14 and 56 respectively. If the number of terms in the AP is 7, its last term is

If are in AP,then the value of is

Find the sum of the series: 7 + 15 + 23 + 31 + 39 + 47 + ……….. + 255

If the first term, the last term and the sum of all terms of an AP are 6, -93,  and -435 respectively,  the number of terms in the AP is ______________

Which of the following values is the sum of the AP -12,-11,.....11?