When testing for current in a cable with 10 color-coded wires, the author used a meter to test 5 wires at a time. How many different tests are required for every possible pairing of 5 wires? Part 1 The number of tests required is ?
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Step 1
This can be calculated using the combination formula: C(n, k) = n! / (k!(n-k)!) where n is the total number of wires (10 in this case) and k is the number of wires we want to choose (5 in this case). C(10, 5) = 10! / (5!(10-5)!) = 10! / (5!5!) = (10 × 9 × 8 × 7 Show more…
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