JEE Math Practice Question
The positive value of $$\lambda $$ for which the co-efficient of x2 in the expression x2 $${\left( {\sqrt x + {\lambda \over {{x^2}}}} \right)^{10}}$$ is 720, is -
- A.4
- B.$$2\sqrt 2 $$
- C.3
- D.$$\sqrt 5 $$
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