The number of four letter words that can be formed using the lette | Filo

Class 11

Math

Algebra

Permutations and Combinations

551
150

The number of four letter words that can be formed using the letters of the word  is :

Solution: Case 1: If all four letters are different then the number of words

Case 2: If 2 letters are R and other 2 different letters are chosen from B, A, C, K  then the number of words

Case 3: If 2 letters are A and other 2 different letters are chosen from B,R,C,K  then the number of words

Case 4: when word is formed using and

Then the number of four-letter words that can be formed
551
150

Connecting you to a tutor in 60 seconds.