Question

Find the number of permutations of the word "helicopter."

Answer 1

The number of permutations of the 10 letters in the word 'helicopter' is given by the following:

`(10!)/(2!)=10*9*8*7\ times6*\5*4*3=1,814,400`
Note that the division by 2! is needed because the e's can be arranged in 2! ways without making a different word.