Central Board Of Secondary Education [CBSE] — science class 10 paper

In science theory paper held on 16 march 2018, in set-1 question no. 12 was printed wrong. We were asked to join three 9 ohm resistors in such a way that equivalent resistance is (I) 13.5 ohm and (Ii) 6 ohm. But equivalent resistance cant be 6 ohm. Instead it should be 3 ohm. Plz provide marks to those students who have attempted that question and have written right answer.