What is the probability that the following system works if each unit fails independently with probability p?

____o_____o_____
| |
_______o________
| |
____o_____o_____

Note: In the above circuit "o" represents 5 relays in the circuit with propability p

2 answers

____o_____o_____
| |
_______o________
| |
____o_____o_____

This is the correct picture
____o_____o_____
|
_______o_______|
|
____o_____o_____|

Sorry. This is the correct picture