5 ways to pick the letter to come 1st. 4 ways left to pick the letter to come 2nd. 3 ways left to pick the letter to come 3rd. 2 ways left to pick the letter to come 4th. 1 way left to pick the letter to come 5th. Answer 5×4×3×2×1 = 5! = P(5,5) = 120 Edwin