AP EAMCET · Maths · Permutation Combination
The number of different permutations that can be formed by taking 4 letters at a time from the letters of the word 'REPETITION' is
- A 1380
- B 1218
- C 1398
- D 1286
Answer & Solution
Correct Answer
(C) 1398
Step-by-step Solution
Detailed explanation
Given letters are \(\mathrm{E}, \mathrm{E}, \mathrm{I}, \mathrm{I}, \mathrm{T}, \mathrm{T}, \mathrm{R}, \mathrm{P}, \mathrm{O}, \mathrm{N}\). Case-I : If all four letters are different then number of four word letters \(={ }^7 P_4=840\) Case II : If two letters are same and two…
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