Author Question: A computer password is made up of four characters. Each character can be a capital letter (A through ... (Read 61 times)

bucstennis@aim.com · **on:** May 5, 2020

Question 1

A computer password is made up of four characters. Each character can be a capital letter (A through Z), a lowercase letter (a through z) or a digit (0 through 9).

How many passwords have 3 letters (uppercase or lowercase) and only one digit?
◦ 4 × 52³ × 10
◦ 4 × 52× 10
◦ 52³ × 10
◦ 52 × 51 × 50 × 10
◦ none of these

Question 2

A computer password is made up of four characters. Each character can be a capital letter (A through Z), a lowercase letter (a through z) or a digit (0 through 9).

How many passwords do not contain the uppercase letter O, the lowercase o, or the number 0?
◦ 62⁴ - 3
◦ 59⁴
◦ 59 × 58 × 57 ×56
◦ 62 × 25 × 25 × 9
◦ none of these

aliotak · **Reply #1 on:** May 5, 2020

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