Stuck on probability?
Being stuck is normal — it means you are learning. Run through the checklist below first; most probability snags untangle in under five minutes. Still stuck? Send a help request.
1 Before you ask: the 5-minute checklist
Work through these in order. Check off each one honestly.
- 1Check equally likely. Can you count individual, equally likely outcomes? If the sections, faces, or marbles are not equal, favorable-over-total does not apply. (Mistake 1)
- 2Find the AND / OR word. “Both happen” means multiply (independent); “one or the other” means add (mutually exclusive). Circle the word first. (Mistake 2)
- 3Try the complement. If the question says “not” or lists many failing cases, compute 1 − P(opposite) instead. (Complement tool)
- 4Draw the tree or list. For two coins or two dice, list every path — HH, HT, TH, TT — before counting. Missing paths is the #1 error. (Experiments Lab)
- 5Simplify the fraction. 12/52 is not finished — reduce to 3/13 before you box the answer.
2 Ask for help
Describe exactly where you are stuck. The more specific you are, the better the help you get.
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