Set Theory, Calendars, Clocks and Binomial Theorem

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Sets and Unions

    In a survey it was found that, the number of people that like only Pepsi, only Coke, both Coke and Pepsi and neither of them are 2n, 3n, 69/n, 69/3n respectively.
    1. 72
    2. 49
    3. Both a and b
    4. cannot be determined

 

  • Correct Answer
    Choice A. 72

Detailed Solution

Since the no. of people cannot be in fraction in any situation. We can deduce that the values of n and 3n need to be factors of 69.
Thus the value of n can only be either 1 or 23.
So the no of people who drink coke is equal to 3n + 69/n = 72 for both 1 and 23.Therefore,
Answer - A
Correct Answer: 72



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