Answer to Question #314632 in Statistics and Probability for Rahil Abbas

Question

In a fuel economy study, each of 3 race cars is tested using 5 different brands of gasoline at 7 test sites located in different regions of the country. If 2 drivers are used in the study, and test runs are made once under each distinct set of conditions, how many test runs are needed?

Answer 1

$N=3\cdot5\cdot7\cdot2=210.$