Solve the problem.
-Using the numerals 0 through 9, how many 6-digit serial numbers can end with the numeral 0 if the first digit must be 0 or 1 and no numerals may be repeated?
A) 70
B) 5040
C) 1680
D) 8

Question

Quizplus · Accepted Answer

The first digit can be chosen in 2 ways (either 0 or 1). The last digit is fixed as 0. This leaves 4 positions to fill with any of the remaining 8 digits (since 0 and the chosen first digit are not available, and digits cannot be repeated). Thus, the number of ways to fill these positions is 8 * 7 * 6 * 5 = 1680.

Solve the Problem. -Using the Numerals 0 Through 9, How Many 6-Digit Serial