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    Question

    How many 7-letter arrangements of “TENSION” exist

    where the two N’s are not adjacent?
    A 1100 Correct Answer Incorrect Answer
    B 1600 Correct Answer Incorrect Answer
    C 2000 Correct Answer Incorrect Answer
    D 1800 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Total arrangements = 7!/2 = 2520 Adjacent N’s = 6! = 720 Required = 2520 – 720 = 1800

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