The task is to generate the correct answer for a given math problem.
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Question: Problem: what is the remainder when 1201 1202 1205 1207 is divided by 6 ?

Answer: 4

Question: Problem: the diameter of the driving wheel of a bus in 140 cm . how many revolutions per minute must the wheel make in order to keep a speed of 33 kmph ?

Answer: 125

Question: Problem: for how many unique pairs of nonnegative integers { a , b } is the equation a ^ 2 - b ^ 2 = 99 true ?

Answer:
3