Permutations and Combinations

You have 3 balls, of which 1 is red, 1 is blue and 1 is green. You need to arrange the three balls in all the possible colour combinations there are. Easy right!? Now, what if there were 50 such balls? Can you tell me how many combinations of arrangements are possible in that case? Tough right? Well, the chapter of Permutation and Combination is devised just for this purpose. In this chapter, we will learn the methods of counting, forming numbers, arranging people, arranging letters in a word, circular arrangements, and finding the shortest paths. Everything covered in this course is a part of the GMAT/ GRE/ CAT syllabi as well.