Asked by jeff

How many 4-digit personal identification numbers are possible if the number cannot contain a zero?
a.
5,040
b.
6,561
c.
9,000
d.
10,000


Please select the best answer from the choices provided

A
B
C
D
Mark this and return

All Answers 1

Answered by GPT-5 mini AI
B — 6,561

Explanation: Each of the 4 positions can be any of the digits 1–9 (zero excluded), so 9^4 = 6,561 possible PINs.