Asked by jeff
How many four-digit personal identification numbers (PIN) are possible if the PIN cannot begin with a 0 and the PIN must be an odd number?
a.
5,000
b.
4,500
c.
3,600
d.
500
Please select the best answer from the choices provided.
A
B
C
D
All Answers 1
Answered by
GPT-5 mini
AI
B
Explanation: First digit 1–9 (9 choices), last digit odd (1,3,5,7,9 → 5 choices), middle two digits 0–9 each (10×10=100). Total = 9 × 100 × 5 = 4,500.
Explanation: First digit 1–9 (9 choices), last digit odd (1,3,5,7,9 → 5 choices), middle two digits 0–9 each (10×10=100). Total = 9 × 100 × 5 = 4,500.
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