Suppose that you have a supply of red, blue, green, and yellow squares. What is the fewest number of different colors needed to form a 3X3 square of tiles so that no tile touches another tile of the same color?

Which question is not a good survey question? a.don't you agree that the financial crisis is essentially over? 63on average, how many hours do you sleep per day? c. what is your opinion of educational funding this year? d.are you happy with the availability of electronic products in your state?