For a positive integer |Binomial Theorem |JEE MAIN 2020

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JEE MAIN 2020

02-096-2020 S2

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For a positive integer $n,\left(1+\frac{1}{x}\right)^n$ is expanded in increasing powers of $x$. If three consecutive coefficients in this expansion are in the ratio, $2: 5: 12$, then $n$ is equal to

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