Solve the problem.
-How many 2-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6, 7, 8, 9, and 0? No digit can be used more than once.
A) 90
B) 45
C) 1,814,400
D) 3,628,800

Question

Quizplus · Accepted Answer

For a 2-digit number, the first digit can be any of the 9 options (1-9, since 0 cannot be the first digit), and the second digit can be any of the remaining 9 digits (including 0 this time). Thus, the total number of 2-digit numbers is 9 * 9 = 81.

Solve the Problem. -How Many 2-Digit Numbers Can Be Formed Using the Digits