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2 years ago

15

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?

1 answer:

grigory [225]2 years ago

5 0

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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