Question

Show how would you join three resistors each of resistance 9 ohm so that equalent resistance of combination is 13.5 ohm and 6 ohm

Answer 1

first for 13.5 the 2 resistors must be in parallel then resultant will be 9/2 with which the 3rd should be in series

second for 9 ohm the 2 resistors must be in series then the resultant wil be 18 which with the 3rd one should be in parallel