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Posted by on Tuesday, October 20, 2009 at 9:41am.

The last part of a telephone number has four digits, e.g. 7814 1487 2103 2772
The last part of the telephone number can start with any digit apart from zero. The other three digits can be any number. How many four digit numbers are there?

  • math - , Tuesday, October 20, 2009 at 10:11am

    9*10*10*10

  • math - , Tuesday, October 20, 2009 at 12:43pm

    Thank you, sorry to be slow but, is that 9,101,010? Can't believe it is this simple!

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