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OpenStudy (anonymous):
helppp Peter has a briefcase that has a 3-digit combination lock where each digit can range from 0 - 9. For his birthday, Peter's wife, Sandy, decided to surprise him by placing Arizona Cardinal tickets in his briefcase for him to find once he was at work. However, Sandy does not know the combination to the briefcase. What is the probability that Sandy guesses the correct combination to the briefcase on her first attempt?
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