500
Think about this: You have made a circuit tester with one battery, one battery holder with Fahnestock clips, a bulb, a bulb socket with Fahnestock clips, and 3 wires. You touch the two ends of your wires together, and your light does not go on. You need to troubleshoot to find out what is wrong. What is the number of possible things, locations and connections you could check to fix the circuit?
9