Question: When testing for current in a cable with 7 color-coded wires, the author used a meter to test three wires at a time. How many

When testing for current in a cable with 7 color-coded wires, the author used a meter to test three wires at a time. How many different tests are required for every possible pairing of three wires?

side note: Please breakdown what ! is in the equation for me

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