JEE Advanced 2018 Paper 1 Mathematics Q9

Mathematics

Problem

Let X be the set consisting of the first 2018 terms of the arithmetic progression 1, 6, 11, …, and Y be the set consisting of the first 2018 terms of the arithmetic progression 9, 16, 23, …. Then, the number of elements in the set X ∪ Y is _____.

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