NEET 2023, Physics Q17: Capacitors And Capacitance

The two $3\mu \text{F}$ capacitors in parallel combine to $3+3=6\mu \text{F}$.

This is in series with the remaining $3\mu \text{F}$:

$C_{eq}=\frac{3\times 6}{3+6}=\frac{18}{9}=2\mu \text{F}$.