Let S = {2, 4, 6, 8, ........, 20}.

What are the maximum number of subsets of S?

Let A $$\cup$$ B = {x | (x $$-$$ a) (x $$-$$ b) > 0, where a < b}. What are A nd B equal to?

If A = {x : 0 $$\le$$ x $$\le$$ 2} and B = {y : y is a prime number}, then what is A $$\cap$$ B equal to?

In a school, 50% students play cricket and 40% play football. If 10% of students play both these games, then what per cent of students play neither cricket not football?