Asked by qwerty

To get a complete collection of stamps, Ann needs to have 5 specific (and different) kinds of stamps, denoted by k1,…,k5. She starts out with no stamps. She then receives 5 stamps randomly from a lottery. Each of these 5 stamps has probability 1/5 of being of any particular kind ki, and the kinds of the different stamps she receives are independent.

1.What is the probability that Ann has a complete collection after receiving the 5 stamps from the lottery?

2.Given that Ann does not have a complete collection after receiving the 5 stamps from the lottery, what is the probability that she is missing exactly one stamp?
Answered by robert
totally lost!!
Answered by unknown
1. 0.0384 (5!/5^5)
2. ???
Answered by anon
Anyone know answer to 2?
Answered by akash
2)

0.4096
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