Four light bulbs P, Q, R, S are connected in a circuit of unknown arrangement. When each bulb is removed one at a time and replaced, the following behavior is observed.
| |
P |
Q |
R |
S |
| P removed |
* |
on |
on |
on |
| Q removed |
on |
* |
on |
off |
| R removed |
off |
off |
* |
off |
| S removed |
on |
off |
on |
* |
Draw the circuit diagram for these bulbs.5
