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How many phone numbers can be made if the rst digit must be 1, the second digit must be a number in the range 3-5, the third digit must be a number in the range (6-9), and the last seven digits can be
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How many phone numbers can be made if the rst digit must be 1, the second digit must be a number in the range 3-5, the third digit must be a number in the range (6-9), and the last seven digits can be any single digit number 0-9?

User Aleix
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1 Answer

3 votes


1\cdot3\cdot4\cdot10^7=120,000,000

User Holgerwa
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