The product of a whole number 'n' with every whole number until 1 is called the factorial. The number of more ways in which Lavalle can line up his books tha Jenny is 4920.
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.
Lavalle has 7 math books to line up on a shelf. Therefore, the number of ways in which the books can be arranged are:
Number of ways for Lavalle = 7! = 5,040
Jenny has 5 math books to line up on a shelf. Therefore, the number of ways in which the books can be arranged are:
Number of ways for Jenny = 5! = 120
The number of more ways = 5040 - 120 = 4920
Hence, the number of more ways in which Lavalle can line up his books tha Jenny is 4920.
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