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Question

How many words can be made from the letters of the word MONDAY assuming that no letter is repeated if 4 letters are used at a time

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Solution

Total no of letters =6

No of letters used at a time =4

No of ways =6C4

6!4!2!=6×5×4!4!×2=15

No of ways of using 4 letters =4!=4×3×2=24

The total no of ways =15×24=360


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