Question
The following Venn diagram shows the number of students
who have visited three different cities (Delhi, Mumbai, Chennai). What is the number of students who have visited at least two of the places out of Delhi, Mumbai, and Chennai?Solution
‘At least two places’ means ‘two or more places’. So, three places should also be included to obtain the final answer. 
Therefore, the number of families who have visited at least two of the places = 24 + 18 + 7 + 6 = 55 Hence, the correct answer is (C).
I. 3x² - 15x + 18 = 0
II. 2y² - 8y + 6 = 0
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