Quantitative Aptitude :: Permutation and Combination - Discussion
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Consider all permutation (i.e. arrangements) of the digits 1 2 and 3. We will say that a hit has been scored if at least one digit occurs in its proper position in the permutation i.e. if one occurs in the 1st position or 2 in the 2nd position or 3 in the 3rd position. In how many of these permutations is a hit scored?
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