16. A bank PIN is a string of four digits, each digit 0-9. How many choices are there for a PIN if the last digit must be even and all the digits must be different from each other? a. 10 · 9 · 8 · 5 b. 9 · 8 · 7 · 5 c. 4 · 3 · 2 · 5 d. none of the above
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Step 1: There are 5 choices for the last digit (0, 2, 4, 6, 8). Show more…
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