![]() We are the most reviewed online GMAT Prep company with 2500+ reviews on GMATClub Take a free GMAT mock to understand your baseline score and start your GMAT prep with our free trial. Now, instead of solving this manually, let us apply the keyword approach to solve this question. If not, then keep note: The word arrangement in a question implies a permutation.This arrangement is known as a permutation.Ĭan you notice the usage of keyword ‘arrangement’ in permutation? But while creating teams, the team composition does not change whether we say AB or BA. This happens because the order of arrangement in case of words matter. However, the selection of A and B gives 2 different words i.e. The 2-letter words that can be formed from 3 letters A, B, and C are:Ĭan you observe that in combination, the selection of A and B gives only 1 team i.e. Let us understand the concept of permutation by solving example 2-įrom 3 letters, A, B, and C, how many 2-letter words can be formed? Keyword approach to identify Permutation Questions The number of ways to select ‘r’ things among ‘n’ things = nCr.Keep an eye on the important keywords like-select, choose, combination in the question stem.Thus, the total ways to select 7 stocks = 10 × 6 × 3 = 180 ways. 2 utility stocks out of 3 utility stocks can be selected in 3C 2 = 3 ways.2 transportation stocks out of 4 transportation stocks can be selected in 4C 2 = 6 ways.3 industrial stocks out of 5 industrial stock can be selected in 5C 3 = 10 ways.Notice the keyword ‘AND’ which indicates all the above 3 events have to occur simultaneously.īy the application of nC r formula, we can write:.He needs to select 2 utility stocks out of 3 utility stocks.He needs to select 2 transportation stocks out of 4 transportation stocks AND,.He needs to select 3 industrial stocks out of 5 industrial stock AND,.The analyst needs to form a different combination of 7 different stocks. Now, we can easily identify that this is selection question, right? Notice the underlined keywords ‘Choose’ and ‘Combinations’ If the analyst can choose from 5 industrial stocks, 4 transportation stocks, and 3 utility stocks, how many different combinations of 7 stocks are possible? ![]() Q 2 – An analyst will recommend a combination of 3 industrial stocks, 2 transportation stocks, and 2 utility stocks. Now, let us solve a slightly difficult question.
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