2 years ago

22

Mathematics

1 answer:

dalvyx [7]2 years ago

8 0

The first digit may be 1 or 8.

The second digit may be 1, 2, 4, 8.

The third digit may be 1, 3, 5, 7, 9.

There are $2\times4\times5=40\:variants$

The probability that this is the correct code is $\frac{1}{40}$

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