Question

how many terms of A. P :24, 21,18,as soon should be taken so that their sum is 78.​

Answer 1

Answer:

So you can take either 4 terms or 13 terms to get the sum 78.

Step-by-step explanation:

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Answer 2

Answer:

13 terms

Step-by-step explanation:

Solving the quadratic equation, we get n=4 and n=13. So you can take either 4 terms or 13 terms to get the sum 78.