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Use a tree diagram for the following. a. Find the number of ways 2 letters can...

Use a tree diagram for the following. a. Find the number of ways 2 letters can be choosen from the set StartSet Upper D comma Upper E comma Upper F comma Upper G comma Upper H EndSet if order is important and repetition is allowed. b. Reconsider part a if no repeats are allowed. c. Find the number of combinations of 5 elements taken 2 at a time. Does this answer differ from part a or​ b?

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