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Starting at 10^9, all numbers have 10 digits. How can we have pandigital numbers in that 10^9 to 10^10 - 1 range? Would a 0 digit be included? If so, why isn't it mentioned in the problem?
No 0 included. There simply isn't any pandigital number in the range you mentioned
FYI, the largest pandigital prime only has 7 digits :)