Question

A 7 character computer password is made up of 4 letters followed by 3 numbers. How many different passwords are possible?
a.
333,135,504
b.
358,800,000
c.
456,976,000
d.
78,364,164,096

Answer 1

Assuming letters can repeat and there are 26 letters and 10 digits, the number is 26^4 × 10^3 = 456,976 × 1,000 = 456,976,000.

Answer: c.