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14 August, 23:07

In how many ways can letters of the set (R, S, T, U,) be arranged to form ordered codes of 2 letters?

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  1. 14 August, 23:09
    0
    RS

    RT

    RU

    SR

    ST

    SU

    TR

    TS

    TU

    UR

    US

    UT
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