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  4. If number of arrangements of letters of word DEPARTMENT taken all at a time when no two T's are together and no two E's are together is N⌊ 7, the N is equal to

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Q. If number of arrangements of letters of word DEPARTMENT taken all at a time when no two T's are together and no two E's are together is $N\lfloor 7$, the $N$ is equal to

Permutations and Combinations

Solution:

Correct answer is (b) 116