Interview Practice
Probability, expected value, and bet sizing — the reasoning that timed online assessments lean on hardest. Free and unlimited with an account.
Each of the 10 generators below draws fresh numbers every time you load it, so you can practise the same concept repeatedly without ever seeing the same question twice — and no answer is worth memorising. Every solution is worked through step by step.
Where these come from
Every question here is written by QAM Labs from the underlying mathematics. We don't reproduce questions from any firm's interview process, any prep site, or any interview-experience post, and nothing here is presented as having been asked by a specific company. Questions are organised by the reasoning skill they test.
Want the timed version instead? Play the probability games →