If a random variable X has the probability distribution P ( X =x)= {k, if x=0; 2 k, if x=1 or 2; 0, otherwise,} then the value of k is

If a random variable X has the probability distribution $$\mathrm{P}(\mathrm{X}=x)=\left\{\begin{array}{l} \mathrm{k}, \quad \text { if } \quad x=0 \\ 2 \mathrm{k}, \quad \text { if } \quad x=1 \text { or } 2 \\ 0, \quad \text { otherwise, } \end{array}\right. $$ then the value of k is