Hi, need help with a probability problem.

According to a certain book, men have a 15.645% chance of dying at age 90. A group of 90-year-old men meet monthly to discuss philosophy and politics. They are discussing the possibility of some of their group dying this year. If 2 men are chosen at random from the group, what is the probability that both of the 2 men will die this year?

Question

Hi, need help with a probability problem. 

According to a certain book, men have a 15.645% chance of dying at age 90. A group of 90-year-old men meet monthly to discuss philosophy and politics. They are discussing the possibility of some of their group dying this year. If 2 men are chosen at random from the group, what is the probability that both of the 2 men will die this year?

anonymous · Answer

how many people are in the group?

anonymous · Answer

That's what I can't understand. It doesn't tell me. What I entered above is all the information I'm given.