find the biggest and smallest 8 digit number that can be formed without repeating the digits
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To write the largest 8-digit number without repeating the digits, you have to use the largest 8 digits from 1 to 9. this gives you 98,765,432.
to write the smallest 8-digit number without repeating the digits, you have to use the smallest 8 digits from 1 to 9. this gives you 12,345,678.
adding 98765432 and 12345678 gives 111,111,110.
subtracting 12345678 from 98765432 gives 86,419,754
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