How many permutations are there of 42 objects when taken 9 objects at a time if a particular one of these objects must always b

Question

How many permutations are there of 42 objects when taken 9 objects at a time if a particular one of these objects must always b included O a 9 42 42 9 O b 9 42 1 42 9 1 O c 9 421 42 9 d 42 421 42 9 2 e 421 42 9 2

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