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Home  >>  JEEMAIN and NEET  >>  Mathematics  >>  Class12  >>  Probability

Probability of getting positive integral roots of the equation $ x^2-n=0$ for the integer $ n \: \: \: 1 \leq n \leq 40$ is

$\begin {array} {1 1} (A)\;\large\frac{1}{5} & \quad (B)\;\large\frac{1}{10} \\ (C)\;\large\frac{3}{20} & \quad (D)\;\large\frac{1}{20} \end {array}$

 

1 Answer

Given
$ x^2=n=0$
$ x = \pm \sqrt n$
$ n = 1,4,9,16,25,36$
$ \therefore $ Required probability = $ \large\frac{6}{40}$
$ \large\frac{3}{20}$
Ans : (C)
answered Jan 16, 2014 by thanvigandhi_1
 
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