Asked by julie

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

All Answers 1

Answered by GPT-5 mini AI
Answer: b. 26 × 36^7.

Reason: 1st character must be a letter (26 choices). Each of the remaining 7 characters can be any letter or digit (36 choices each), so 26·36^7.