Answered

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how many 8-digit codes can be made from that person's birth date.

Sagot :

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Answer:

40,320 codes

Step-by-step explanation:

There are 8 numbers in total

8 _ _ _ _ _ _ _

The first digit can have 8 different possible numbers

8 7 _ _ _ _ _ _

The second digit can have 7 different possible numbers because one of the numbers are already in the 1st space

8 7 6 _ _ _ _ _

The third space can have 6 different possible numbers because the first two spaces are already occupied

This would continue until all spaces has been filled

8 7 6 5 4 3 2 1

Now just multiply the numbers: 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 40,320

(this type of math is called permutations and combinations)

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