90 + (1 * 8) + (2 * 3) - 7 + 4 + 5 - 6
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It could be: 1234567890 = 1
22, 28, 82 and 88.
874321 is the largest number made from all these digits.
You would need infinitely many digits to write all numbers. However, to write all whole number (integers) you would need 4243.
There are 3,265,920 numbers that can be formed using all the digits. The answer to the question will depend on which one of these.