How Many Nonisomorphic Unrooted Trees Are There with Four Vertices

question 23

Essay

How many nonisomorphic unrooted trees are there with four vertices? Draw these trees.

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Definitions:

Odds Ratio

is a measure of association between an exposure and an outcome, representing the odds that an outcome will occur given a particular exposure, compared to the odds of the outcome occurring without that exposure.

Exposure Status

The classification of individuals or groups in a study according to their level or type of exposure to a factor of interest, which may be related to disease outcomes.

Relative Risk

A ratio comparing the probability of an event occurring in an exposed group to a non-exposed group.

Fasting Glucose

Measurement of blood sugar levels after abstaining from food and drink (except water) for at least 8 hours, used in diagnosing diabetes.