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ok here's how i solved it..
this is not a good way but it solved it
i looped till 100000 (a missing zero) which will not take so long to end, got the numbers d1,d10....d100000
so I still have d1000000 to find
since d1000000 is between 0 and 9
I tried all the numbers and found out that 210 is the correct answer
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