This may seem like the answer is too large, but if you start thinking about how only one book needs to be different for the group of 4 books to be considered a different group, it begins to make more sense. We are finding C(25,4), so the second number is 4.įrom this, we see that there are C(25, 4) = 12,650 different groups of 4 books that could be selected. Step 4: Type the second number and press To select 3: nCr, you can either highlight the 3 or just press the 3 button. You can use the right arrow to select the menu at the top. Thus, a combination can be used to answer this question: C(25, 4) or “25 choose 4”. Here, you only care about which four books are chosen, not the order. How many different groups of 4 books can be selected from your collection? You are taking a week-long trip and decide to bring 4 books from your collection of 25 books.
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