17. In how many ways can letters of the set {R, S, T, U} be arranged to form ordered codes of 2 letters? (no letters are repeated) A. 16 B. 72 C. 12 D. 120
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We have 4 options for this. After choosing the first letter, we need to choose the second letter of the code. We have 3 options for this, as we cannot repeat any letters. Show more…
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