Question: 1. Solve n+3)(n+2)! (n+1)! 30 2. How many different permutations are there of 5 objects from a set of 7 different objects, if repetition

1. Solve n+3)(n+2)! (n+1)! 30 2. How many different permutations are there of 5 objects from a set of 7 different objects, if repetition is not allowed? 3. Marta is writing a science fiction story in which the serial number of a starship can have one, two, or three different letters, followed always by four different numerals. How many different starship serial numbers are possible?

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