Combination of Resistors question from JEE Main 2025 (28 Jan, Shift 1)

Answer: (d)

1. The top wire joins the left end to the node between the 2nd and 3rd resistors; the bottom wire joins the node between the 1st and 2nd resistors to the right end.
2. So each of the three $\tfrac{r}{3}$ resistors is connected directly between the two ends: all three are in parallel.
3. $R_{eq} = \dfrac{r/3}{3} = \dfrac{r}{9}$. So the answer is (d).