More Questions from Permutation and Combination

In how many different ways can the letters of the word 'LEADING' be arranged so that the vowels always come together?

Aptitude Permutation and Combination Difficulty: Medium
Choose an option
  • A
    720
  • B
    360
  • C
    840
  • D
    1200
  • E
    None of these

Answer

Correct Answer: 720

Explanation

Problem restatementCount arrangements of 'LEADING' where the vowels form one adjacent block.

Given data

  • Word: L, E, A, D, I, N, G (7 distinct letters).
  • Vowels: E, A, I (3 vowels).
  • Consonants: L, D, N, G (4 consonants).

Concept/ApproachBlock the vowels as [V]; arrange [V] with the 4 consonants (5 items), then permute vowels inside [V].

Step-by-step calculation Arrange 5 items: 5! = 120 Permute vowels (E, A, I): 3! = 6 Total arrangements = 120 × 6 = 720

Verification/AlternativeAll letters are distinct; no division by factorials for repeats is needed.

Final Answer720

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