find a 9-digits number, consist of 1 to 9, use each number only once.

so that:

the first 8 digits represent a number that can be divided by 8,

the first 7 digits represent a number that can be divided by 7,

the first 6 digits represent a number that can be divided by 6, and so on....

remember, never look for the answer until you give your best effort to find it.

the answer is:

to solve this math question, you should know about the test of divisibility of a number.

such:

a number can be divided by 2 if it is even.

a number can be divided by 3 if the sum of all the digits can be divided by 3

a number can be divided by 4 if its last two digits number can be divided by 4

and so on...

so the answer is:381654729

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## 1 comment:

hoiii..mamo....nice posting!, i will find it....

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