There’s a street on which all houses are numbered sequentially (1,2,etc) except that a house number cannot be a multiple of 10. Each house owner wants to buy a new number plate (with same numbers as before), so they go to a store to buy number plates. The store has 100 of each numbers (eg 100 0's, 100 1's, etc.), if the house owners are catered sequentially, which will be the first house number for which a number plate won’t be available?
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