What is Double Counting or Multiple Counting? The answer is incorrect, and it is incorrect because we double counted some cases. So, think, is this the right way to solve this question? This is how usually a lot of student approach this question and then wonder if this is the correct way to solve the question or not. Then I will worry about selecting the extra 1 book from the remaining 8 books. That will help us ensure that I have one book of each type. Hmm…so let us select 1 paperback and 1 hardback first. We need to select 5 books such that there is at least one paperback book and at least one hardback book. How many possible selections of 5 books from the shelf contain at least one paperback and at least one hardback? ( OG question) There are 10 books on a shelf, of which 4 are paperbacks and 6 are hardbacks. Let us look at a very simple example to understand a common mistake. In this article, we will explain 3 most common mistakes that a student makes in PnC questions and along with that we will also explain how to avoid these mistakes.
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