Answer:
Total number of possible secrets = 468,000
Step-by-step explanation:
total number of places are 5 . out of which 3 places are filled by 10 numbers from 0 to 9 which cannot be repeated therefore
number of choice of filling first place for a number is 10
number of choices of filling second place is 9
number of choices of filing third place is 8
number of choice of filling letters at first place of alphabet = 26
number of choices of filling letters at second place of alphabet =25
therefore total number of possible codes = 10x9x8x26x25
=468,000
