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Question

Find the probability that in a random arrangement of the letters of the word 'UNIVERSITY' the two I's do not come together ?

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Solution

Total number of words formed by UNIVERSITY = 10!2!Taking two I's together, number of ways to arrange letters of the wordUNIVERSITY = 9!Probability (two I's come together) = 9!10!2!= 15so, Probability (two I's do not come together) = 1-15= 45

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