find the probability of an event that mobile number does not contain zero digit.
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Step-by-step explanation:the probability that the first digit is 0,1,4, or 9 = 4/10 the probability that the second digit is one of the three not yet selected = 3/10 the probability that the third digit is one of the two not yet selected = 2/10 the probability that the final digit is the remaining one from the set of 0,1,4,9 = 1/10
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