A survey of 500 farmers showed that of the​ farmers, 26 grew only​ wheat, 114 grew only​ corn, 93 grew only​ oats, 211 grew​ wheat, 68 grew wheat and​ corn, 56 grew wheat and​ oats, and 194 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. This is an application of sets problem with a venn diagram. I don't know how to do the venn diagram backwards or how to do the math. Please help

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