The number of four letter words that can be formed using the lette | Filo
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Class 11

Math

Algebra

Permutations and Combinations

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

Correct Answer: Option(d)
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
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