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11 November, 20:29

The access code for a car's security system consists of four digits. the first digit cannot be 1 and the last digit must be even or zero. how many different codes are available?

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  1. 11 November, 21:21
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    For the 1st digit we can use 9 of them (it cannot be 1). For the 2nd and the 3rd we can use 10 and for last one we can use 5 digits (0, 2, 4, 6 and 8).

    9 · 10 · 10 · 5 = 4,500

    Answer: 4.500 different codes.
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