How many words with or without meaning, can be formed by using all the letters of the word, 'DELHI' using each letter exactly once?
720
150
120
100
Explanation:
The word 'DELHI' has 5 letters and all these letters are different.
Total number of words (with or without meaning) that can be formed using all these 5 letters using each letter exactly once
= Number of arrangements of 5 letters taken all at a time
= $^5P_{5}$
=5!
=5×4×3×2×1
=120