There are three dials on a combination lock. Each dial can be set to one of the numbers 1, 2, 3, 4, 5 The three digit number 514 is one way the dials can be set as shown in the diagram. a) Work out the number of different three digit numbers that can be set for the combination lock. (2) b) How many of the possible three digit numbers have three different digits? (2) Total marks: 4
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Each dial can be set to one of the numbers 1, 2, 3, 4, or 5. Therefore, there are 5 options for each dial. Show more…
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