Probability question w/ letters

Question

Q: Find the number of possible call letters of a radio station (6 letters long) if the first letter must be a W or K and no letter is repeated.

Answer 1

The above tutor is correct. What we're talking about is permutations without repetition.

Answer 2

if the first letter must be W or K, then the possibility is 2;

the rest of 5 must be selected from the rest of 25 letters, the possibility is 25x24x23x22x21;

so the total possible call letters is 2x25x24x23x22x21=12751200.