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JEE Main 2015 Mathematics question

MathematicsBinomial TheoremJEE Main 2015

If the coefficient of the three successive terms in the binomial expansion of are in the ratio , then the first of these terms in the expansion is

Answer: (4)

Solution

Let the three coefficients be . From the first ratio, , giving . From the second, , giving , i.e. .

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Question ID VK-115289