Question

how can three resistors of resistance 3 ohm and 6 ohm and 9 are connected to give a total resistance of (a) 18 ohm​

Answer 1

keep all in series combination

Answer 2

❇️❇️❇️Heya mate !! ❇️❇️❇️

your answer .... ✍️✍️

$total \: resistance \: = \: 18 \: ohm \\ \\ 3 + 6 + 9 = 18 \: ohm \\ \\ hence \\ \\ all \: three \: should \: be \: connected \: in \: series.$

hope helps ❣️❣️