Welcome to your interview.
The question is on your right: Sequential Draws Without Replacement. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
You have a box with 3 red marbles and 7 blue marbles. You draw two marbles one after the other, without putting the first one back.
What is the probability that both marbles are blue?