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- For what value of n, are the nth terms of two APs: 63, 65, 67,… and 3, 10, 17,… equal?
- For what value of n, the nth terms of the sequences 3, 10, 17,... and 63, 65, 67,... are equal.
- If the sum of the first n terms of an AP is 4n – n^2, what is the first term (that is S1).
- The first and the last term of an AP are 17 and 350 respectively. If the common difference is 9, how many terms are there and what is the sum.
- If the sum of the first n terms of an AP is 4n – n^2, what is the first term (that is S1)?

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