JEE Main 2025 Mathematics question
The number of 6-letter words, with or without meaning, that can be formed using the letters of the word 'MATHS' such that any letter that appears in the word must appear at least twice, is .
Answer: 1405
Solution
Single letter: 5 words. Two distinct letters: 500 words. Three distinct letters: 900 words. Total = 1405.