You may have thought that the number of possible outcomes in the sample space is $\displaystyle{2}+{6}\usepackage{cmbright}\Huge\$ , but it is not. Instead, use the Fundamental Counting Principle to find the size of the sample space. There are two possible outcomes in the event space: {T1, T2}. Divide the size of the event space by the size of the sample space to find the probability. The correct answer is $\displaystyle\frac{{1}}{{6}}.\usepackage{cmbright}\Huge\$