1.

Show that a_(1), a_(2), ….,a_(n),… form an A.P where an is defined as below : (i) a_(n) = 3 + 4n (ii) a_(n) = 9 - 5n. Also find the sum of the first 15 terms in each case.

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ANSWER :(i) 525, (II) `- 465`


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