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JEE Main 2004 Mathematics question

MathematicsSequence and SeriesJEE Main 2004

Let be the rth term of an A.P. whose first term is a and common difference is . If for some positive integers , and , then equals

Answer: (1)

Solution

and . Subtracting: \frac\frac\frac{m-n}{mn}$

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Question ID VK-038445