Question

How many different arrangement could be made with the letters in the name
KERRY ST GEORGE

Answer 1

There are 13 letters in total, so there are 13! permutations. But we don't differentiate between the same letters so we have to divide it by permutations of the same letters - E-3! , R-3!, G-2!

Therefore we have

$\dfrac{13!}{3!3!2!}=86486400$