exercise and diet are being studied as possible substitutes for medication to lower blood pressure three groups of subjests will be used to study the effect of exercise group 1 is sedentary while group 2 walks and group 3 swims for 1 hour a day half of each of the three exercise groups will be on a salt-freee diet an additional group of subjects will not exercise or restrict but will take the standard medication
use (Z) for sedentary, (W) for walker,(S) for swimmer , (Y) for salt, (N) for no salt, (M) for medication and (F) for medication free
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a)with the aid of a tree diagram, show all elements of the sample space S
b)Given that A is the set of non-medication subjects and B is the set of walkers list the elements of (A U B)
C)List the elements of ( A ∩ B)
i'm not really sure how the tree diagram should look. i started with S and which had three branches (W, S, Z) and then those three branches all had S and N branches. and i don't know what to do with M and F