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Mathematics 15 Online
OpenStudy (anonymous):

p

OpenStudy (anonymous):

Oh god.

OpenStudy (kainui):

You can think of the sisters as one group that can be arranged 3! ways within a group of 5 (the 4 boys and 1 clump of girls).

OpenStudy (kainui):

So, 5!*3!=720 yay maths

OpenStudy (agent0smith):

Good answer @Kainui

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