SRMJEE 2017 Paper with key

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Question : 105 of 155

Marks: +1, -0

The middle term in the expansion of (x+1/x)‌2n‌i‌s‌1.3‌.5.....(2n−1)/2n!

1.3.5....(2n−1)(2n)/n!
1.3.5....(2n−1)/n!.2n
2n!/n!.2n
none of the above

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