Answer:
b. 11,880
Explanation:
You can choose 1 out of 12 for the first one.
12 ×
Then, you choose 1 out the remaining 11 for the second one.
12 × 11
Then there are 10 left for the third and 9 left for the 4th.
12 × 11 × 10 × 9 = 11,880
Answer: 11,880