Answer:The product of a whole number 'n' with every whole number until 1 is called the factorial. The number of ways these 12 donors can stand in line is 18,480.
What is a factorial?
The product of a whole number 'n' with every whole number until 1 is called the factorial. The factorial of 4 is, for example, 43221, which equals 24.
Given at a blood drive, 6 donors with type O+ blood, 3 donors with type A+ blood, and 3 donors with type B+ blood are in line. Therefore, the number of ways 12 donors can stand in a line is,
Number of ways = (12!)/(6!×3!×3!) = 18,480
Hence, the number of ways these 12 donors can stand in line is 18,480.
Explanation: