When a certain driver parks their car in the evenings, they are equally likely to remember or to forget to switch off the headlights. Giving your answers in their simplest index form, find the probability that on the next 16 occasions that they park their car in the evening, they forget to switch off the headlights:

a. 14 more times than they remember to switch them off

b. At least 12 more times than they remember to switch them off.