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  1. In how many ways, the letters of the word 'STRESS' can be arranged ?
    1. 360
    2. 240
    3. 720
    4. 120
    5. None of the above
Correct Option: D

Required number of arrangements = 6 ! / 3 ! [∵ S has come thrice ]
= [ 6 x 5 x 4 x 3! ] /3 !
= 120


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