Posted by **JHONY** on Wednesday, October 13, 2010 at 4:30pm.

The list of 16 topics was given to students to prepare for

exam. 16 students prepared themselves for all 16 topics, 6 students prepared

for 10 topics, and 3 students prepared only for 6 topics each. The rst

invited student was prepared for 2 topics contained in the ticket. What was

a probability that it was one of the students prepared for all 16 topics?

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