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A) 24

answer is D

The answer is D.

nope, it will be C

4!.3!.2!.1!=288

sorry u r right….D

The answer is A. 24

although it is 10 books , but Chelsea wants to regroup them into four groups

Yep, that’s it – the answer is (D). :).

Congrats to those who got it.

Remember, once we’ve figured out how many ways the books can be arranged within groups (24 x 6 x 2) = 288, we have to factor in how many ways the groups can be arranged: 4!. Therefore, we get 24×288, or (D).