Question

For two coins tossed, \(A\) is the event of getting at least one tail. Which pair gives \(A\) and \(n(A)\)?

Options

• \(A = \{TT, TH, HT\}\), with \(n(A) = 3\)

• \(A = \{HH, TT\}\), with \(n(A) = 2\)

• \(A = \{HH, HT, TH\}\), with \(n(A) = 3\)

• \(A = \{HH, HT, TH, TT\}\), with \(n(A) = 4\)

Answer 1

The outcomes with at least one tail are \(TT\), \(TH\), and \(HT\). The outcome \(HH\) has no tail, so it is excluded, giving \(n(A) = 3\).