Mathematics

Mathematics

Problem

10. Show that a1,a2,…,an,…a_{1}, a_{2}, \ldots, a_{n}, \ldots form an AP⁡\operatorname{AP} where ana_{n} is defined as below : (i) an=3+4na_{n}=3+4 n (ii) an=9−5na_{n}=9-5 n Also find the sum of the first 15 terms in each case. (i) an=3+4na_{n}=3+4 n (ii) an=9−5na_{n}=9-5 n

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