If $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ are mutually exclusive and exhaustive events of a random…
If $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$ are mutually exclusive and exhaustive events of a random experiment such that $P(A)=\frac{2}{3} P(B)$ and $P(B)=2 \cdot P(C)$ then $P(A \cup C)=$