How many terms of the `A.P` `21,18,15.......` have the sum `0`?

How many terms of the A.P. 22, 26, 30, ... has the sum 400?

How many terms are there in A.P

How many terms of the A.P. 54, 51, 48, ... has the sum 513 ? Explain the double answer.

(a) How many terms of the A.P. 6 + 10 + 14 + ... has the sum 880 ? (b) How many terms of the A.P. 3 + 9 + 15 + ... has the sum 7500 ?

How many terms of the AP 3, 7, 11, 15,…. Will make the sum 406?

How many terms of the A.P. 1,4,7,... are needed to give the sum 925 ?

How many terms of the AP 27, 24, 21 ......should be taken so that their sum is zero.

How many terms of the AP 21, 18, 15,… must be added to get the sum 0?

Which term of the AP,21,18,15,... is -81?

How many terms of the A.P. 17+15+13+… has the sum 72? Explain the double answer.