Ace the JEE Maths permutations and combinations class 11 topic in no time with the help of our Extrashorts by Extramarks video. In this video, you will see how to find the rank of a word in the dictionary, when digits are non-repeating.
The first thing to do is write down the letters in alphabetical order of the given word. We’ll then start by calculating the total number of possible combinations from the letters. Then, in alphabetical order, find the list of letters and begin with the lowest letter instead of calculating all the possible combinations. First, we’ll look at the second letter. Thus, we begin by adding up all of the possible permutations and combinations. In general, using dictionaries to solve problems is akin to having a list of sorted words (in terms of alphabets). The only thing left to do now is figuring out where the term belongs in these lists of sorted words. For this, we must identify all the possible combinations preceding the necessary word using manual calculations (that is, permutations and combinations).
Thus, finding the rank of a word in permutation and combination will seem like an easy topic. Use our Class 1 permutation and combination JEE Maths video to help get a thorough understanding of the chapter.
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