Unidentified 61201

The set contains 12 different figures. How many unidentified individual figures do I have to buy to have precisely two complete sets with a 90% probability after unpacking them?

Correct answer:

x =  27

Step-by-step explanation:

n=2 12=24 p=90%=10090=109=0.9   x   p = n  x=n/p=24/0.9=27



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