A man is creating a super strong four-letter password for his phone. He can use can use any letter and they cannot repeat. How many possible passwords can he make?

Question

I'm not sure I'm doing this correctly but would you do

26*25*24*23 = 358800

I get confuse using the slot method but i would hope someone could help explain.

Answer 1

Yes, your calculation is correct.

26 letters are possible for the first letter.

25 letters are possible for the second letter (no repetitions!)