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Mathematics, 10.03.2020 18:52 bazsinghnagoke
Mark can remember only the first 4 digits of his friend's phone number. He also knows that the number has 7 digits and that the last digit is not a 0. If Mark were to dial all of the possible numbers and if it takes him 22 seconds to try each one, how long would it take to try every possibility?
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Mark can remember only the first 4 digits of his friend's phone number. He also knows that the numbe...
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