How many words can be formed by using 3 letters from the word 'DELHI'?

Question: How many words can be formed by using 3 letters from the word 'DELHI'?

Solution:
Here we will use the Permutations for this question.
We know,
​ ⁿP_r, for this we have,
n = 5, Total 5 Letters
r = 3, Letters word we required

​Now,
ⁿP_r = n!/(n-r)!
= ⁵P₃
​= 5!/2!
​= 120/2
​= 60

So, Total we can form 60 different permutation of word from Letter Delhi.