$\sqrt{2\frac{1}{4}}=?$
(a) $2\frac{1}{2}$
(b) $1\frac{1}{2}$
(c) $1\frac{1}{4}$
​​​​​​​(d) None of these

Q. $\underset{n\to \infty }{\lim }\left\{\frac{1}{1-n^2}+\frac{2}{1-n^2}+...+\frac{n}{1-n^2}\right\}$ is equal to

(a) 0
(b) −1/2
(c) 1/2
(d) none of these

Q.

If $3ta{n}^{-1}\frac{1}{2+\sqrt{3}}-ta{n}^{-1}\frac{1}{x}=ta{n}^{-1}\frac{1}{3}$, then $x=$

Q.

The complete set of values of 'a' such that $x^2+ax+a^2+6a$ < 0 $\forall$ x $ϵ$ [-1, 1] is:

Q. Four persons are selected at random out of 3 men, 2 women and 4 children. The probability that there are exactly 2 children in the selection is
(a) 11/21
(b) 9/21
(c) 10/21
(d) none of these