If $A=\left[\begin{array}{ll}x & 1 \\ 1 & 0\end{array}\right]$ and $A=A^{-1}$, then $x=\ldots \ldots$

Which of the following function is not continuous at $x=0$ ?

It is observed that $25 \%$ of the cases related to child labour reported to the police station are solved. If 6 new cases are reported, then the probability that atleast 5 of them will be solved is

For a GP, if $S_n=\frac{4^n-3^n}{3^n}$, then $t_2=$ ...........