Are these independent events? Intuitively, the answer is "no". After all, whether or not the coins match depends on how the first coin comes up: if we toss HH, they match, but if we toss TH, then they do not. However, the mathematical definition of independence does not correspond perfectly to the intuitive notion of "unrelated" or "unconnected". These events actually are independent! claim 1. Events A and Bare independent. Proof We must show that Pr(A n B) Pr(A) Pr(B). Step 1: Find the Sample Space. As shown in the tree diagram below, there are four possible outcomes HH, HT, TH, and TT.