1
$\begingroup$

I got this from a friend.

There are $43$ potential essay prompts. Six will show up on the history final, and you will have to choose $3$ to write about. What is the minimum number essay prompts that you should prepare for, such that the probability that the final has more than $3$ prompts that you haven't prepared for is less than $20\%$?

1 Answers 1