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JEE Main 2025 Mathematics question

MathematicsSequence and SeriesJEE Main 2025

Let A = {1, 6, 11, 16, …} and B {9, 16, 23, 30, …} be the sets consisting of the first 2025 terms of two arithmetic progressions. Then n(A ∪ B) is

Answer: (4)

Solution

Common terms form AP with first term 16, common difference LCM(5,7)=35.

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Question ID VK-002720