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A social security number is a sequence of nine digits. Determine the number of social security numbers that satisfy the following conditions:

a. There are no restrictions.
b. The digit 8 is never used.
c. The sequence does not begin or end with 8.
d. No digit is used more than once.

1 Answer

2 votes

Answer:

765314290

Explanation:

doesn’t use 8

Not start with 8

Digits used only 1’cd

User Tranvutuan
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