Class 11MathematicsPermutation and CombinationDefinition of permutation, Number of permutations with or without repetition, Conditional permutations
Difficult${ }^{15} P_8 = A + 8 \cdot { }^{14} P_7 \Rightarrow A = $
- A${ }^{14} P_6$
- B${ }^{14} P_8$
- C${ }^{15} P_7$
- D${ }^{16} P_9$
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