5 b iv ) The options are Sarah gets 1 and Terry gets (1+4) = 5
or
Sarah gets 2 and terry gets (2+4) = 6
The probability now
for the first Sarah gets 1 = 1/6 ; Terry gets 5 = 1/6 . Total = because of "And" --> 1/6 * 1/6 = 1/36
for the second one Sarah gets 2 = 1/6 ; Terry gets 6 = 1/6. Total = because of "And" --> 1/6 * 1/6 = 1/36
Due to the "or" we add the two sets up = 1/36 + 1/36 = 2/36 = 1/18