How many rooted and unrooted phylogenetic trees, respectively, are possible with four different sequences?

How many rooted and unrooted phylogenetic trees, respectively, are pos

1.	How many rooted and unrooted phylogenetic trees, respectively, are possible with four different sequences?
A.	3 and 15
B.	15 and 3
C.	15 and 12
D.	12 and 3
Answer» C. 15 and 12

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How many rooted and unrooted phylogenetic trees, respectively, are possible with four different sequences?

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