Kate and tom have three friends
Bob only knows Kate
Dino is a mutual friend of Helen and Monica
Helen any Jim don't have any mutual friend
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Alice and Bob just met and there are chances that 5% of the people are friends with each one of them. There is a population of 1000 people. 50 of them are their friends.
Explanation:
- X= Number of mutual friends.
- Ai= 1, ith person is the mutual friend.
- P (X=k)= 50/k. 950(50-k)/1000/50
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