How many terms of the AP 65,60,55,....be taken so that their sum is

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How many terms of the ap 65,60,55,....be taken so that their sum is

How many terms of the AP 65,60,55,....be taken so that their sum is

How many terms of the AP 65,60,55,....be taken so that their sum is
How many terms of the AP 65,60,55,....be taken so that their sum is