Class 11MathematicsPermutation and CombinationDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
Medium${ }^{20}P_5 - { }^{19}P_5 = $
- A$5 \times { }^{19}P_4$
- B$4 \times { }^{19}P_4$
- C$5! \times 646$
- D$6! \times 646$
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