3 years ago

(Number 13) CAN SOMEONE PLEASE HELP ME!!

Mathematics

1 answer:

otez555 [7]3 years ago

7 0

A. 25 Keep in mind AB = BC!

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Step-by-step explanation:

Set it up
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in a five character password the first two characters must be digits and the last three characters must be letters if no charact

Vilka [71]

Answer:

1,404,000 unique passwords are possible.

Step-by-step explanation:

The order in which the letters and the digits are is important(AB is a different password than BA), which means that the permutations formula is used to solve this question.

Permutations formula:

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$P_{(n,x)} = \frac{n!}{(n-x)!}$

In this question:

2 digits from a set of 10(there are 10 possible digits, 0-9).

3 characters from a set of 26. So

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1,404,000 unique passwords are possible.

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