OpenStudy (anonymous):

Um, does anyone also understand this? Abelardo wants to create several different 7-character screen names. He wants to use arrangements of the first 3 letters of his name (abe), followed by arrangements of 4 digits in 1984, the year of his birth. How many different screen names can he create in his way?

3 years ago
OpenStudy (anonymous):

Total number of screen names possible: 6*24 = 144

3 years ago
OpenStudy (anonymous):

wait, but how did u get the numbers 6 and 24?

3 years ago
OpenStudy (anonymous):

# of arrangements of abe: 3! = 6 ---- # of arrangements of 1984: 4! = 24

3 years ago
OpenStudy (anonymous):

do u get it?

3 years ago
OpenStudy (anonymous):

oh ok

3 years ago
OpenStudy (anonymous):

thank-you so much :)

3 years ago
OpenStudy (anonymous):

no prob =D

3 years ago