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Permutation Question (1 Viewer)

Arucerious

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I'm new to perms and comms so how do I do Q7)B-D and while I'm at it, what formula do you use for those type of questions with restrictions?
 

Drsoccerball

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For question (d), I don't understand how you know that in half of the words, K is left of C, and in the other half, C is left of K.
Theres two options. It can either be on the right or left therefore 50/50.
 

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