Chapter: Probability· Mathematics Part 1 (Algebra)
Answer: \(P(A) = \dfrac{3}{4}\)
S = {HH, HT, TH, TT}, n(S) = 4
Event A: at least one head, i.e. one or two heads. A = {HH, HT, TH}, n(A) = 3
\(P(A) = \dfrac{n(A)}{n(S)} = \dfrac{3}{4}\)