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30 April, 23:12

A garage door opener has a ten number keypad. Codes to open the door must consist of 5 digits with no adjecent digits the sane. How many codes are possible?

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  1. 1 May, 02:10
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    1st slot: 10 possibilities

    2nd slot: 9 possibilities

    3rd slot: 9 possibilities

    4th slot: 9 possibilities

    5th slot: 9 possibilities

    10 * 9 * 9 * 9 * 9 = 65610 Possibilities
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