Study the given diagram carefully and answer the question that follows.
The numbers in different sections indicate the number of people who have coffee, tea, and ice cream.
How many people have all three i.e. Ice cream, Tea as well as Coffee?
If x −\( \frac{1}{x} \) = 5, then the value of x⁴ + \( \frac{1}{x^4} \) is: