ConceptSum of First n Terms of an AP

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#### Question

Show that a_{1}, a_{2 }… , a_{n} , … form an AP where a_{n} is defined as below

a_{n} = 3 + 4n

Also find the sum of the first 15 terms in each case.

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#### Reference Material

Solution for concept: Sum of First n Terms of an AP. For the course CBSE