Question 35133
f,g,h,i,j & k
When you say no letters can repeat themselves, you do not have to worry there are no two of the same letters!
P(6,4)=6!/(2!)=360
Just as  venugopalramana said, that is the many ways, but schools usually put permutations as P(n,r) notation ....
P(n,r) is the same as nPr