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If the Letters of the Word Krisna Are Arranged in All Possible Ways and These Words Are Written Out as in a Dictionary, Then the Rank of the Word Krisna Is,324,341,359,None of These - Mathematics

MCQ

If the letters of the word KRISNA are arranged in all possible ways and these words are written out as in a dictionary, then the rank of the word KRISNA is

Options

  • 324

  • 341

  • 359

  • none of these

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Solution

324
When arranged alphabetically, the letters of the word KRISNA are A, I, K, N, R and S.

Number of words that will be formed with A as the first letter = Number of arrangements of the remaining 5 letters  = 5!

Number of words that will be formed with I as the first letter = Number of arrangements of the remaining 5 letters = 5!

∴ The number of words beginning with KA = Number of arrangements of the remaining 4 letters = 4!

The number of words starting with KI = Number of arrangements of the remaining 4 letters = 4!

Alphabetically, the next letter will be KR.
Number of words starting with KR followed by A, i.e. KRA = Number of arrangements of the remaining 3 letters = 3!

Number of words starting with KRI followed by A, i.e. KRIA = Number of arrangements of the remaining 2 letters = 2!

Number of words starting with KRI followed by N, i.e. KRIN = Number of arrangements of the remaining 2 letters = 2!

The first word beginning with KRIS is the word KRISAN and the next word is KRISNA.

∴ Rank of the word KRISNA = 5! + 5! + 4! + 4! + 4! + 3! + 2! + 2! + 2 = 324

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APPEARS IN

RD Sharma Class 11 Mathematics Textbook
Chapter 16 Permutations
Q 12 | Page 46
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