Question

In a room filled with 7 people, 4 people have exactly 1 sibling in the room and 3 people have exactly 2 siblings in the room. If two individuals are selected from the room at random, what is the probability that those two individuals are NOT siblings?

• A. $\frac{5}{21}$
• B. $\frac{3}{7}$
• C. $\frac{4}{7}$
• D. $\frac{16}{21}$

Answer 1

The correct option is D $\frac{16}{21}$

Option D is the correct answer. Check the video for the approach.