How many numbers from 1 to 100 are there not having digit 1?
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Answer 80
Step-by-step explanation: 2,3,4,5,6,7,8,9,20,22,23,24,25,26,27,28,29,30,32,33,34,35,36,37,38,39,40,42,43,44,45,46,47,48,49,50,52,53,54,55,56,57,58,59,60,62,63,64,65,66,67,69,68,70,72,73,74,75,76,77,78,79,80,82,83,84,85,86,87,88,89,90,93,92,94,95,96,97,98,99
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