Question

Consider the 10 letter-word W = CURRICULUM.
Number of ways in which 5 lettered words can be formed using the letters from the word 'W' if each 5 lettered word has exactly 3 different letters, is​

Answer 1

Explanation:

You can use three distinct letters in P(4,3)=4⋅3⋅2=24 ways. ways to form a word with a repeated letter. Consequently, there are 24+18=42 distinguishable three letter words that can be formed with the letters of the word SERIES. Their are six letters.