The sum of the first 20 terms of an arithmetic progression whose first term is 5 and common difference is 4, is __________.

Find the 10th term of an arithmetic progression whose first term is 'd' and common difference is 'b'.

The sum of first 5 terms of an arithmetic progression is 80,third term will be __

It the sum of first 10 terms of an arithmetic progression with first term p and common difference q , is 4 times the sum of the first 5 terms, then what is the ratio p : q ?

The sum of the first 51 terms of the arithmetic progression whose 2nd term is 2 and 4th term is 8, is ________.

Find the sum of the first 22 terms of an AP whose first term is 4 and the common difference is (4)/(3) .

What is the sum of the first 9 terms of an arithmetic progression if the first term is 7 and the last term is 55?

What is the sum of the first 12 terms of an arithmetic progression, if the first term is 3 and the last term is 47?

Write the formula to find the sum of first n terms of an Arithmetic progression, whose first term is a and the last term is a_n .