Find an example in which the claim of the sentence obtains-

Question

For each of the following sentences, find an example in which the claim of the sentence obtains:

(a) The sets C₁ and C₂ are approachable by Player 1, but the set C₁ ∩ C₂ is excludable by Player 2.

(b) The set C₁ is approachable by Player 1, the set C₂ is excludable by Player 2, and the set C₁ \ C₂ := C₁ ∩ (C₂) c is excludable by Player 2.

(c) The sets C₁ and C₂ are excludable by Player 2, but the set C₁ ∪ C₂ is approachable by Player 1.