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- Answer the question :
- How many terms of the A.P. - 6, - 11/2, - 5, .... are needed to give the sum - 25 ? Explain the double answer.
- Prove that the nth term of an A.P. can not be n^2 + 1. Justify your answer.
- How many terms of the AP 20, 19 1/3, 18 2/3, ........ must be taken so that their sum is 300? Explain the double answer.
- How many terms of the AP 63, 60, 57, 54, ….. must be taken so that their sum is 693? Explain the double answer.

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