Calculating Permutations A teacher has four books—A, B, C, and D—to assign to four students in any order he prefers
Set S includes all possible arrangements of the four books
Set X includes all possible arrangements when book C is chosen first and D is chosen second.
Which notation is correct?
If book C is chosen first and D is chosen second, in how many ways can the teacher assign the books?

55/i dont know i do it for the points

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c

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explanation:

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and 90% of people marry there 7th grade love. since u have read this, u will be told good news 2night. if u don't pass this on nine comments ur worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of ur life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love u

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