How many terms of the AP 1,2,3,... must be taken so that their sum is 55

How many terms of the AP:24,21,18,... must be taken so that their sum is 78?

How many terms of the AP 24,21,18,…. Must be taken so that their sum is 78?

How many terms of the AP 24,21,18,…. Must be taken so that their sum is 78?

How many terms of the A.P : 9,6,3,"….." must be taken so that their sum is 78 ?

How many terms of the AP : 24, 21,18,... must be taken so that their sum is 78?

How many terms of the A.P. 9,17,25.....must be taken so that their sum is 636.

How many terms of the A.P.9,17,25, must be taken so that their sum is 636?

How many terms of the A.P. 24,20, 16, ... must be taken so that the sum may be 72? Explain the double answer.

How many tems of the AP: 24, 21, 18,… must be taken so that their sum is 78?

How many terms of the A.P.63,60,57,..... must be taken so that their sum is 693?