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. By the application of nC r formula, we can select 3 members from 9 members in 9c 3 ways, which.Thus, we have to select 3 members among 9.
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