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JEE Main 2014 Mathematics question

MathematicsSequence and SeriesJEE Main 2014

Given an A.P. whose terms are all positive integers. The sum of its first nine terms is greater than 200 and less than 220. If the second term in it is 12, then its term is :

Answer: (3)

Solution

, so gives ; as all terms are integers, or 24. With , $ = 12

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Question ID VK-104409