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Question

Find the number of arrangements that can be formed by using all the letters of the word MATRIX, so that the vowels occupy even places.

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Solution

NumberoflettersinMATRIX=6evenpositions=2nd,4thand6thtwovowelsA,Isotwovowelsinthreeplacescanbearrangedin=3×2=6waysRestfourpositionscanbefilledby4lettersin=4!ways=24waysTotalpermutation=24×6144


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