Concerning the first 41 presidents of the United States we know the following facts:
Eight held cabinet posts, 14 served as vice-president, 15 served in the U.S. Senate, 2
served in cabinet posts and as vice-president, 4 served in cabinet posts and in the U.S.
Senate, 6 served in the U.S. Senate and as vice-president, and 1 served in all three
positions (6 pts).
How many presidents served in:
a. none of these 3 positions?________
b. only in the U.S. Senate?_________
c. at least one of the three position?________
d. exactly two positions?________
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