Answer: Third Option is correct.
Explanation:
Since we have given that
Probability of a visitor riding its largest roller coaster=P(L) = 30%
Probability of a visitor riding its smallest roller coaster =P(S)= 20%
Probability of a visitor riding its both roller coasters =P(L and S)= 15%
According to the formula, we get
So, Probability of largest or smallest is 35%.
Hence, Third Option is correct.