A random number is selected between 100 to 999. what is the probability that it will not contains the digit ‘7' is
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100 + 90 + 90 - 10 - 10 - 9 + 1 = 252. Number of 3 digit numbers with no 7 in any of its digits = 900 - 252 = 648. Probability(Number not having digit 7) = 648 / 900
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