Class 11MathematicsPermutation and CombinationDefinition 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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