How many numbers are there not having the digit 4 form 1 to 100?
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I think your answer is 80
4, 14, 24, 34, 40, 41,42,43, 44, 45, 46, 47, 48, 49, 54, 64, 74, 84, 94
there are two four in = 44
total = 20
100 - 20 = 80
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