How many toursits visited not more than one city?
Explanation:
Consider the solution to first question of this set.
The number of toursits who did not visit more than one city = (Number of people who did not visit any city) + (Number of people who visited exactly one city)
= 20 + (a + b + c)
= 20 + 380 = 400
Hence, option (d).
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