Question 34
Back to Exercise
How many 4-digit PINs can be made from the digits 0 to 9 if no digit repeats?
- A 5,040 Correct
- B 10,000
- C 210
- D 4,536
Correct Answer: Option A
10 × 9 × 8 × 7 = 5,040
Trap: 4,536 forbids 0 in front, but a PIN may start with 0.
Answer: 5,040
Discussion & Comments 0
Share your method, a shortcut, or ask about a step you didn't follow.
No comments yet. Be the first to share your solution!