A survey of
500
farmers showed that of the farmers,
121
grew only wheat,
113
grew only corn,
92
grew only oats,
200
grew wheat,
60
grew wheat and corn,
5858
grew wheat and oats, and
179
grew corn.
Determine the number of farmers who a) grew at least one of the three, b) grew all three, c) did not grow any of the three, and d) grew exactly two of the three.
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