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9 August, 12:54

The technology company DataGenetics suggests that 17.8% of all four-digit personal identification numbers, or PIN codes, have a repeating digits format such as 2525. Assuming this to be true, if the PIN codes of five people are selected at random, what is the probability that at least one of them will have repeating digits? Round your answer to four decimal places.

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  1. 9 August, 15:30
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    0.6247

    Explanation:

    Probability = 1 - P (Do not have repeating digits) ⁵

    = 1 - (0.822) ⁵

    = 0.6247
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