Question

1. an automated teller machine (atm) requires a four - digit pin number, where each digit is 0 - 9. how many possible pin numbers are there if repetition of digits is permitted? = enter your next step here pin numbers

Explanation:

Step1: Count digits per position

Each of the 4 PIN positions has 10 choices (0-9).

Step2: Calculate total combinations

Multiply the number of choices for each position.
$$10 \times 10 \times 10 \times 10 = 10^4$$

Step3: Compute the final value

$$10^4 = 10000$$

Answer:

10000