Thread: permutation

hello what is the permutation for determining the letters of a word DEAFEATED in which the E's are seperate from each other..

Originally Posted by sigma1

hello what is the permutation for determining the letters of a word DEAFEATED in which the E's are seperate from each other..

without any condition , the number of permuatation of this word is

\frac{9!}{3!2!2!}=15120

when all the 'E's are to be together , no of permutations :

\frac{7!}{2!2!}=1260

so when all the 'E's are not to be together , no of permutations

=15120-1260