# Is this a permutation?

• October 12th 2010, 12:38 PM
terminator
Is this a permutation?
John has forgotten his password to log on his computer. He knows the password is made up of 5 letters in the word "speed". What is the maximum number of passwords Greg has to check to find the right one?

24
60
120
240

is 5! or 5!/2! ??
Thanks
• October 12th 2010, 12:40 PM
Plato
Because of the two e's it is $\dfrac{5!}{2}$