Question 357275


Here there are 9 letters in which 's' is two times and 'e' is two times.


no. of ways to arrange m letters where some letter are repeated n, r, s,...times

= m!/ [(n!)(r!)(s!)........]


in this question m= 9, n= 2, r = 2


no. of ways = 9!/[2! * 2!] = 90720


here there is arrangement of letters in word, so we will use permutation.

9! is actually arrangement of 9 letters from 9 letters = 9P9 = 9!






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