1.

Show that a_(1), a_(2),……, a_(n)…. Form an AP where a_(n) 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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