gyankalakumbhKNOWLEDGE. ART. POSSIBILITY.Logic & puzzles • Classes 9–12
Needed—but is it enough?
One condition may be essential without guaranteeing success.
Take your time. Speak, draw or write your answers.
Here is what is happening.
A necessary condition must hold for a result, but may not be sufficient by itself. In an imagined library, borrowing requires a valid card and an available copy. A valid card is necessary under this rule; it alone does not guarantee that a copy is available.
Pause. Make the idea your own.
Explain one idea to a partner, draw it or write it in your own words. Which part is an observation, an example or a question?
You can use a home language. No need to share personal experiences or finish everything in one sitting.Your little investigation
What you need
Paper and a pencil, or a partner to talk with. Drawing and speaking are welcome.
Write the two borrowing conditions and connect them with AND.
Test all four combinations of card valid/invalid and copy available/unavailable.
Invent another rule and identify a necessary but insufficient condition.
Is a valid card alone sufficient under this rule?
KEEP ASKING
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