Solve the following questions. (i) Che...

Solve the following questions.
(i) Check whether the sequence `-3, -1,1,3`,…. Is an A.P. If it is an A.P., find the common difference.
(ii) If the 7th term of an A.P. is 40, then find `S_(13)`.

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The correct Answer is:

yes, d=2, (ii) 520

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