Question

how many terms of the AP 24,21,18,..... must be taken so that their sum is 78? Explain why we get two answers?​

Answer 1

Answer: the 12 terms should be added

Step-by-step explanation:

See attachment for method

Answer 2

Answer: the 12 terms should be added

Step-by-step explanation:

See attachment for method

Answer 3

Answer: the 12 terms should be added

Step-by-step explanation:

See attachment for method