Phone number
In an island of numerolandia there are 9,100 inhabitants, if each inhabitant has exactly one telephone number and all have the same number of digits, what is the minimum number of digits that the inhabitants' telephone numbers can have?
Restriction: The zero digit can not be at the beginning of a telephone number.
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1 solution
As per given condition 1st no. should be 10000
Last no. is 10000 + (9100 - 1) = 19099