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JEE Advanced Mathematics question

MathematicsBinomial TheoremJEE Advanced

If , the coefficient of in the expansion of is

Answer: (D)

Solution

= + = (1 - + - + )(1 - x + - + ).

Collect the terms (pair from the first bracket with from the second):

1ยท(-1) + Missing or unrecognized delimiter for \left\left

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Question ID VK-108400