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Permutations and Combinations question

2016 · Shift 0 · Q35
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Permutations and Combinations question

2016 · Shift 0 · Q35

JEE MainMathematicsPermutations and CombinationsMCQ+4 / −1
If all the words (with or without meaning) having five letters,formed using the letters of the word SMALL and arranged as in a dictionary, then the position of the word SMALL is :
  1. A
    46th{46^{th}}46th
  2. B
    59th{59^{th}}59th
  3. C
    52nd{52^{nd}}52nd
  4. D
    58th{58^{th}}58th
View written solutionFree

Correct answer: D

  1. Arrange the letters in alphabetical order

The word is SMALL, whose letters are:

S,M,A,L,LS, M, A, L, LS,M,A,L,L

In dictionary order, the letters are:

A<L<M<SA < L < M < SA<L<M<S

Since there are two LLL's, we must account for repetition.


  1. Find how many words come before SMALL\text{SMALL}SMALL

We count dictionary-wise, letter by letter.

Step 1: First letter smaller than SSS

Possible smaller letters are A,L,MA, L, MA,L,M.

(i) First letter AAA

Remaining letters: S,M,L,LS, M, L, LS,M,L,L

Number of distinct arrangements:

4!2!=12\frac{4!}{2!}=122!4!​=12

(ii) First letter LLL

Remaining letters: S,M,A,LS, M, A, LS,M,A,L

All distinct, so number of arrangements:

4!=244!=244!=24

(iii) First letter MMM

Remaining letters: S,A,L,LS, A, L, LS,A,L,L

Number of distinct arrangements:

4!2!=12\frac{4!}{2!}=122!4!​=12

So total words before those starting with SSS:

12+24+12=4812+24+12=4812+24+12=48


  1. Now fix first letter as SSS

We now consider words beginning with SSS and count those before SMALL\text{SMALL}SMALL.

Current pattern: S____S\_\_\_\_S____

Remaining letters: M,A,L,LM, A, L, LM,A,L,L

Step 2: Second letter smaller than MMM

Among remaining letters, smaller than MMM are A,LA, LA,L.

(i) Second letter AAA

Remaining letters: M,L,LM, L, LM,L,L

Number of arrangements:

3!2!=3\frac{3!}{2!}=32!3!​=3

(ii) Second letter LLL

Remaining letters: M,A,LM, A, LM,A,L

All distinct, so number of arrangements:

3!=63!=63!=6

Total:

3+6=93+6=93+6=9

So words before SM...SM...SM... among those starting with SSS:

48+9=5748+9=5748+9=57


  1. Now fix first two letters as SMSMSM

Pattern: SM___SM\_\_\_SM___

Remaining letters: A,L,LA, L, LA,L,L

Step 3: Third letter smaller than AAA

There is no letter smaller than AAA.

So contribution is:

000


  1. Now fix first three letters as SMASMASMA

Pattern: SMA__SMA\_\_SMA__

Remaining letters: L,LL, LL,L

Step 4: Fourth letter smaller than LLL

No letter smaller than LLL among remaining letters.

Contribution:

000


  1. Now fix first four letters as SMALSMALSMAL

Remaining letter is LLL, so no further contribution.

Thus total number of words before SMALL\text{SMALL}SMALL is:

575757

Hence the rank of SMALL\text{SMALL}SMALL is:

57+1=5857+1=5857+1=58


  1. Compare with stored correct answer

Derived answer is:

58th58^{\text{th}}58th

This matches option DDD.

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