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JEE Main 2002 Mathematics question

MathematicsBinomial TheoremJEE Main 2002

and are positive integers , and coefficient of term and term in the expansion of are equal, then equals

Answer: (3)

Solution

In , . So the th term has coefficient and the th term has . Equality gives either $r + 1 = 3r - 1

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Question ID VK-038009