How many different Zip Codes are possible using the old style (five digits) and the new style (nine digits) ?

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Social Studies

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9 April, 10:21

How many different Zip Codes are possible using the old style (five digits) and the new style (nine digits) ?

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Answers (1)

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Valentina Oneill · Answer 1

old style (five digits)

Solution: 10*10*10*10*10=105

the new style (nine digits)

Solution: 10*10*10*10*10*10*10*10*10=109 the old style if it cannot start with a zero

Solution: 9*10*10*10*10=9*104 = 90,000