The positive value of l for which the co-efficient of x 2 in the expression 10 2 2 æ ö l ç ÷ + è ø x x x is 720, is:


The positive value of $\lambda$ for which the co-efficient of $x^{2}$ in the expression $x^{2}\left(\sqrt{x}+\frac{\lambda}{x^{2}}\right)^{10}$ is 720 , is:

  1. 4

  2. $2 \sqrt{2}$

  3. $\sqrt{5}$

  4. 3

Correct Option: 1

JEE Main Previous Year 1 Question of JEE Main from Mathematics Binomial Theorem and its Simple Applications chapter.
JEE Main Previous Year Jan. 10, 2019 (II)


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