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– Anon

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- Answer the question :
- Which term of the AP : 21, 18, 15, . . . is – 81? Also, is any term 0? Give reason for your answer.
- 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.

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