How many words with or without meaning, can be formed by using all the letters of the word "DELHI", using each letter excatly once?

120

The correct answer is Option (1) → 120

 The word, 'DELHI' contains 5 different letters.

Total number of words formed by using all the letters of the given word

⁵P₅ = 5! = (5×4×3×2×1) = 120.

Hence, the required number of words =120