on a table we arrange in a line four stones. two of them are small two of them are large two of them are green two of them are purple which one of the answers are not needed in order to determine the exact order of this stones? 1.each green stone stayes between a big stone and a small stone 2.both of the big stones are close one to the another 3.the stone on the right edge is purple 4.the green stones have the same size i dont know where to start how to deside what answer to start with?? i dont know how to find this answer ??