Question:

All the letters of the word $ANIMAL$ are permuted in all possible ways and the permutations thus formed are arranged in dictionary order. If the rank of the word $ANIMAL$ is $x$ . then the permutation with rank $x$ , among the permutations obtained by permuting the word $PERSON$ and arranging the permutations thus formed in dictionary order is

Updated On: Jun 17, 2022
  • ENOPRS
  • NOSPRE
  • NOEPRS
  • ESORNP
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The Correct Option is D

Solution and Explanation

If we arrange the letter of word ANIMAL in alphabetic order then, we get AAILMN, now to find the rank of word ANIMAL, $x$ (given)

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Now, similarly for word PERSON, if we arrange the letters in alphabetic order, we get ENOPRS, now to find the word having 107 ways,



So, ESORNP is required word.
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Concepts Used:

Permutations

A permutation is an arrangement of multiple objects in a particular order taken a few or all at a time. The formula for permutation is as follows:

\(^nP_r = \frac{n!}{(n-r)!}\)

 nPr = permutation

 n = total number of objects

 r = number of objects selected

Types of Permutation

  • Permutation of n different things where repeating is not allowed
  • Permutation of n different things where repeating is allowed
  • Permutation of similar kinds or duplicate objects