A female chef is presenting a pineapple and watermelon that is graced with a design on each fruit .
It is impossible that the chef is preparing a fruit dish for a customer 's birthday .
It is impossible that the chef is preparing a fruit dish for a customer 's birthday .
There is a better than even chance that the chef is preparing a fruit dish for a customer 's birthday .
The chef is preparing a fruit dish for a customer 's birthday .