Logical deduction
Treat every premise as true and choose the conclusion that holds in every case the premises allow.
Example
Example
Example
An example to explore. No score or practice round is recorded.
6 questions · Explanation after each answer
6 questions · No time limit
- Answered
- 0 / 6
- Active time
- 0:00
Try six questions.
Treat every statement as true. Which conclusion must follow?
Possible changes
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Explore the method
Trace what the premises guarantee without adding assumptions about the groups.
On by default unless you turn it off. Saved choices are kept. Shares starts, completions, replays and error categories. For ChatGPT visits, starts and completions may include the first QuickenBrain page and country. No answers, drawings or names.
How this data is usedHelp
The names are labels for imaginary groups. Use only the statements shown. “Some” means at least one. “All” and “No” do not prove that a group contains anything. Choose what must hold in every possible case, not what might be true.
Select one of four conclusions, then choose Check. You can change your selection before checking. Read the explanation and continue when ready. With a keyboard, use Tab to reach the answers and the arrow keys to change your choice.
Solving time excludes setup, explanations and time spent in another tab. The optional challenge gives you two minutes for all six questions. Unanswered questions count as incorrect when time runs out. Timed and untimed results stay separate.
A new round needs an internet connection. Once all six questions load, they work on your device. Completed rounds and timed-out challenges are saved when browser storage is available. Rounds ended early are not saved, and individual answers are not uploaded.
This is a practice activity, not a standardized or diagnostic assessment. Results describe only this activity.
Keyboard: press an answer's letter or number to choose it, Enter to check, and Enter again to continue.
About this practice
Learn a method
Follow only certain linksTreat every premise as true and choose the conclusion that holds in every case the premises allow.
Report a problem
On by default unless you turn it off. Saved choices are kept. Shares starts, completions, replays and error categories. For ChatGPT visits, starts and completions may include the first QuickenBrain page and country. No answers, drawings or names.
How this data is used