17-36 ■ Fundamental Counting Principle These exercises involve the Fundamental Counting Principle
Social Security Numbers Social Security numbers consists of nine digits, with the first digit between and , inclusive. How many Social Security numbers are possible?
The number of Social Security numbers possible.
The social security number consists of digits, with the first digit between and 6, inclusive.
By Fundamental Principle of Counting, If two events occur in order and if the first event can occur in ways and the second can occur can occur in ways (after the first occurred), then the two events can occur in order in ways.
For the first digit there are seven possible choices, because the first digit is in between and 6, inclusive, digits 7, 8, and 9 are not allowed
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