Discussion
How many villages were visited by at least one salesman ?
Answer: B
18 villages were visited by at least one salesman.
There are 20 villages, and 2 of them were visited by neither salesman. Every other village was visited by A, by B or by both, so the number visited by at least one is 20 - 2 = 18.
As a check: 14 + 12 - 8 = 18, using the 8 villages both of them visited. The option 26 is 14 + 12, which counts those 8 twice, and 20 forgets the 2 villages that neither visited.
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