write the smallest 7 digit number having only 4 different digits
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Smallest number other than 0 is 1, so we shall take 1. Thereby, we shall place 0, (can be repeated four times) then 2 and then 3 will complete 7 digits. Thus the smallest 7 digit number with four digits will be 1000023
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1000023
it is having 4 diffrent digits..
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