Build the observation event, distinguish fresh restarts from retained information, and compare exact expected inspection work under explicit sampling assumptions.
Open any lesson. Completion records participation; automatic practice checks and human judgment of written arguments are separate. This unit retains its own versioned requirements.
Readiness and preparation
Check your starting point
Try these short questions on paper, then compare your reasoning. They are optional self-checks, not a placement score or a navigation requirement. Use a targeted review when useful and return with your browser’s Back control.
Does observing a marked token mean the hand was sampled uniformly among hands containing a marked token?
The reporting mechanism determines the conditional distribution.
Compare reasoning and find a refresher
Not generally. Randomly revealing a hand member weights a hand by its fraction of marked tokens. Conditioning on containment instead weights every qualifying hand equally.
Separate terminal outcome probabilities, unresolved capped runs and expected attempts, while checking that a restart really reproduces the same independent experiment.
Derive eventual success and almost-sure termination from disjoint finite stopping events.
Compute capped probabilities and expected work by finite geometric sums before taking limits.
Handle certain restart and diagnose when retained state invalidates an iid restart equation.