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a certain book has 500 pages numbered 1,2,3, and so on. how many times does the digit 1 appear in the page numbers?

Sagot :

236 because it 1,10,11,12,13,14,15,16,17,18,19,21,31,41,51,61,71,81,91,100 to 199,201,210,211,221,231,241,251,261,271 and so on and so fourth