JEE Main 2024 Mathematics question
The total number of words (with or without meaning) that can be formed out of the letters of the word 'DISTRIBUTION' taken four at a time, is equal to .
Answer: 3734
Solution
The letters are I ×3, T ×2 and D, S, R, B, U, O, N once each (9 distinct letters). Four letters all different: ⁹C₄ × 4! = 3024. Two alike plus two different: ²C₁ ×
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