so, we have got these letters abcad. how many groups with 4 letters can we create, so that we do not repeat the letters??
I think there might be 4!/2 groups !

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\[{5\choose 1} * {4 \choose 1}*{3 \choose 1}*{2 \choose 1} = 5!\]

I do not understand?
as the letter a is two times we should divide with 2!
is it right?

Ack! I didn't notice a was in there twice.

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