Question

Which of the following expressions shows the number of 8 character passwords that can be formed using letters and digits if the password must begin with a letter?
a.
21 times 36 superscript 7
b.
26 times 36 superscript 7
c.
26 superscript 5 baseline times 10 superscript 3
d.
36 superscript 8



Please select the best answer from the choices provided


A
B
C
D

Answer 1

B

Explanation: First character must be a letter (26 choices). Each of the remaining 7 positions can be any letter or digit (26 + 10 = 36 choices). Total = 26 × 36^7.