Dice and Probability — Category A/B

Select which die faces belong to Category A, simulate rolls, and watch proportions for A vs B.

How to play

Choose how many rolls to add. Then choose which faces belong to Category A (Category B will be the remaining faces). Press Roll now to add that many rolls. Press Restart to clear results. Changing Category A also clears results to keep things fair.

Probability note: The probability of an event equals the number of favorable outcomes divided by the total number of possible equally‑likely outcomes (that is, P(event) = \# favorable ÷ \# possible). For a fair die, P(rolling a 1) = 1⁄6 ≈ 0.1667 and P(Category A) = (size of Category A)⁄6.

Controls

How many rolls to add?
Events to include in Category A

At least one face must remain selected. Changing any checkbox clears results.

Adds the selected number of die rolls to the simulation. Clears all results and resets counts to zero. Category selections remain as chosen.

Results

Die Roll Outcome (proportion)
Die Roll Outcome Two bars show the proportion of Category A and Category B outcomes. Y-axis ranges from 0 to 1 with major grid lines at 0.10 and minor at 0.05.

Total rolls: 0. Current proportions — Category A (1): 0.0000 and Category B (2, 3, 4, 5, 6): 0.0000

CategoryFacesCountProportion
 Counts and proportions for Category A and Category B. Table updates after each action.