Class 11MathematicsPermutations and CombinationsDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
MediumEight different letters of an alphabet are given. Words of four letters from these are formed. The number of such words with at least one letter repeated is:
- A$\binom{8}{4} - {}^{8}P_{4}$
- B$8^{4} + \binom{8}{4}$
- C$8^{4} - {}^{8}P_{4}$
- D$8^{4} - \binom{8}{4}$
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