Probability that two people are in same group, If there are 16 groups of 25 people each

[rosargia]

If there are 16 groups of 25 people each, equally probable, what is the probability that two specific people are in the same group?

 

[stapel]

If there are 16 groups of 25 people each, equally probable, what is the probability that two specific people are in the same group?

What are your thoughts? What have you tried? How far have you gotten?

Please be complete. Thank you!

Eliz.

 

[khansaheb]

If there are 16 groups of 25 people each, equally probable, what is the probability that two specific people are in the same group?

What is the probability that a specific person will be assigned to a particular group?

 

[Steven G]

Randomly pick one person from some group--say group 1
Now what is the probability that the 2nd person is also from group 1?