Consider all possible permutations of the letters of the word ENDEANOEL. Match the Statements/Expressions in Column I with the Statements/Expressions in Column II.
| Column I | Column II | ||
|---|---|---|---|
| (A) | The number of permutations containing the word ENDEA is | (P) | 5! |
| (B) | The number of permutations in which the letter E occurs in the first and the last position is | (Q) | 2 5! |
| (C) | The number of permutations in which none of the letters D, L, N occurs in the last five positions is | (R) | 7 5! |
| (D) | The number of permutations in which the letters A, E, O occur only in odd positions is | (S) | 21 5! |
- A(A) - p ; (B) - s; (C) - q ; (D) - q
- B(A) - q ; (B) - q ; (C) - s ; (D) - p
- C(A) - p ; (B) - s; (C) - p ; (D) - r
- D(A) - p ; (B) - r ; (C) - q ; (D) - p
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Correct answer: A
The given word is ENDEANOEL. We need to find the number of permutations based on different conditions.
First, let's analyze the letters in the word ENDEANOEL: Total number of letters = 9. The letters are: E (3 times), N (2 times), D (1 time), A (1 time), O (1 time), L (1 time).
Let's evaluate each statement in Column I.
(A) The number of permutations containing the word ENDEA is
- We can treat the word "ENDEA" as a single block or a single unit. Let's denote this block by (X).
- The letters used to form the block "ENDEA" are E, N, D, E, A. The original letters of ENDEANOEL are {E, E, E, N, N, D, A, O, L}.
- After forming the block, the remaining letters are {E, N, O, L}.
- We now need to arrange the 5 items: {(ENDEA), E, N, O, L}. These 5 items are all distinct.
- The number of permutations of these 5 distinct items is .
- .
- This matches with (P) in Column II, which is . Therefore, (A) -> (P).
(B) The number of permutations in which the letter E occurs in the first and the last position is
- The word has 9 positions. We fix the letter E at the first and the last positions. E _ _ _ _ _ _ _ E
- We have used two of the three E's. The remaining 7 letters are {E, N, N, D, A, O, L}.
- These 7 letters need to be arranged in the 7 middle positions.
- In this set of 7 letters, 'N' is repeated 2 times.
- The number of permutations is given by .
- We need to express this result in terms of (). .
- This matches with (S) in Column II, which is . Therefore, (B) -> (S).
(C) The number of permutations in which none of the letters D, L, N occurs in the last five positions is
- There are 9 positions in total. We can conceptually divide them into two sets: the first four positions and the last five positions.
- The letters specified are D, L, and N. In the word ENDEANOEL, we have D, L, N, N. These are 4 letters.
- The condition states that these 4 letters (D, L, N, N) cannot be in the last five positions. This implies they must occupy the first four positions.
- The remaining 5 letters are {E, E, E, A, O}. These letters must occupy the last five positions.
- First, let's find the number of ways to arrange {D, L, N, N} in the first four positions. Since 'N' is repeated twice, the number of ways is .
- Next, let's find the number of ways to arrange {E, E, E, A, O} in the last five positions. Since 'E' is repeated thrice, the number of ways is .
- The total number of such permutations is the product of these two values: .
- Expressing 240 in terms of : .
- This matches with (Q) in Column II, which is . Therefore, (C) -> (Q).
(D) The number of permutations in which the letters A, E, O occur only in odd positions is
- In a 9-letter arrangement, there are 5 odd positions (1, 3, 5, 7, 9) and 4 even positions (2, 4, 6, 8).
- The letters A, E, O refer to all occurrences of these letters in the word. The set of vowels is {A, E, E, E, O}, which are 5 letters in total.
- The set of consonants is {N, N, D, L}, which are 4 letters in total.
- The condition requires that the 5 vowels {A, E, E, E, O} must be placed in the 5 odd positions.
- Consequently, the 4 consonants {N, N, D, L} must be placed in the 4 even positions.
- The number of ways to arrange the vowels in the 5 odd positions is (since E is repeated 3 times).
- The number of ways to arrange the consonants in the 4 even positions is (since N is repeated 2 times).
- The total number of such permutations is the product: .
- Expressing 240 in terms of : .
- This matches with (Q) in Column II, which is . Therefore, (D) -> (Q).
Summary of Matches: (A) -> (P) (B) -> (S) (C) -> (Q) (D) -> (Q)
This corresponds to the option: (A) - p ; (B) - s; (C) - q ; (D) - q.
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