Relation between equilibrium constants of related reactions

2024 Re-NEET 1 question

1. At a given temperature and pressure, the equilibrium constant values for the equilibria are given below: $3A_2+B_2\rightleftharpoons2A_3B,\ K_1$ and $A_3B\rightleftharpoons\dfrac{3}{2}A_2+\dfrac{1}{2}B_2,\ K_2$. The relation between $K_1$ and $K_2$ is: