Acombination lock has digit from 0 to 39 on it . three numbers are required to open the lock. how many combinations are possible if you cannot have the same digit twice in a row

A combination lock has digits from 0 to 39. three numbers are required to open.
how many combinations are possible if you cannot repeat any digits?
40*39*38 = 59280

How many combinations are possible if you cannot have the same digit twice in a row?

Call the number F, S, and T for 1st, 2nd, and 3rd
F is 1/40
S is any but F, = 1/39
T is any but S, = 1/39
40*39*39 = 60840 

Sis less than or equal to 75 (bottom left)