In a survey of 238 professional athletes, it was found that 127 of them owned a convertible, 113 of them owned a giant screen TV, and 99 owned a sporting goods store. 23 owned a convertible and a store, 43 owned a TV and a store, and 66 owned a covertible and a TV. 15 owned all three items.
a. How many athletes did not own any of the three items?