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

Question

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

KnowledgeBoat · Accepted Answer

In above A.P. a = 24 and d = -3. We know that, S = Let sum of n terms be 78. Hence, no. of terms = 4 or 13.

Mathematics