Checkpoint: math warm-up

Eight quick questions to lock it all in before you meet your first qubit.

Lesson 5 of 5 about 6 min

Question 1 of 8 · Chances

Eight questions, one from every corner of this level. If you miss one, you can try again, and your first-try score is shown at the end. No pressure: this is for you, not a test.

Your turn

A bag holds 3 red marbles and 1 blue marble. You pull one out without looking. What's the chance it's blue?