how many different tests are required for every possible pairing of two wires?when testing for current in a cable with five color coded wires, the author used a meter to test two wires at a time.
The number of different wires present = 5
The number of wires tested at a time = 2
There for number of possible ways given by `^5C_2`
Number of possible pairings `= ^5C_2`
` = 10`
There are 10 possible pairings.