Show that form an AP

MATHEMATICS · Multi-part · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

Show that a1,a2,…,an,…a_1,a_2,\ldots,a_n,\ldots form an AP, where ana_n is defined below. Also find the sum of the first 1515 terms in each case. (i) an=3+4na_n=3+4n (ii) an=9−5na_n=9-5n

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