Barry has 4 wooden identically shaped and sized blocks. 2 are blue, 1 is red and 1 is green. How many distinct ways can barry arrange the 4 blocks in a row? Barry's friend Billie is colour-blind and cannot distinguish between red and green. How many of Barry's distinct arrangements would Billie see different?
a) I probably don't understand the question... does the order of the color matter? If not: there are 4! = 24 ways to arrange the blocks in a row??