A random variable $X$ has the following probability mass function as follows:$\begin{array} {llllllll} \textbf{X:}& -2& 3 & 1 \\ \textbf{P(X=x):}& \large\frac{\lambda}{6}& \large\frac{\lambda}{4} &\large\frac{\lambda}{12} \end{array}$ Then the value of $\lambda$ is

Question

$$\begin{array}{1 1}(1)1&(2)2\\(3)3&(4)4\end{array}$$