Frank lost a contact lens in the kitchen; he is searching for it by examining each linoleum tile in turn to see if the lens is contained within the square

Gemma similarly lost a lens in the kitchen; she is looking for it near the base of the fridge and around the stove, the two appliances she remembers using when she was last in the kitchen. Which of these individuals is using an algorithm?
a) Only Frank is using an algorithm.
b) Only Gemma is using an algorithm.
c) Both Frank and Gemma are using algorithms.
d) Neither Frank nor Gemma is using an algorithm.

ANS: A, Frank's method is time-consuming, but it will guarantee that he finds the lens. Gemma is using a reasonable shortcut that may well work, but it may not.