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#1 2008-09-17 13:30:45
- tony123
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- Registered: 2007-08-03
- Posts: 230
divisible by 9
It is well known that a number is divisible by 9 if and only if the sum of the digits is divisible by 9. For example,
is divisible by 9, and 396 = 9 x 44. Let's introduce the operator as one that sums the digits in a number, so that . With all this in mind, can you determine the value of ?Last edited by tony123 (2008-09-17 13:32:46)
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#2 2008-09-17 14:37:09
- JaneFairfax
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- Registered: 2007-02-23
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Re: divisible by 9
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