Question

The dial of a combination lock has all 26 letters of the alphabet on it. A combination is formed by dialing 3 different letters in a particular order. If the owner of the lock forgets the combination, how many trials may be needed to open the lock?

a)17576
b)15600
c)78

Answer 1

b

Explanation:

Answer 2

3 differnent letters
once you use one, ou can't use again
slot method
26 options for 1st slot
25 options for 2nd ( 1 went to firstt slot)
24 otpoins for 3rd

mulipl together

26*25*24=15600 options

B is answer