In a group of 40 players, 25 play Cricket, 20 play Tennis, and 8 play both. How many players play only Tennis?
Answer: A
Let T be the set of players who play Tennis.
Let C be the set of players who play Cricket.
Given n(T) = 20 and n(T ∩ C) = 8.
The number of players who play only Tennis is given by n(T) - n(T ∩ C).
Number of players who play only Tennis = 20 - 8 = 12.