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Cause-effect

Logic Level 1

Alice's cat always sneezes just before it rains.
Alice heard her cat sneeze and thought "It will rain soon".
Is Alice guaranteed to be right?

Yes, she is No, she is not

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Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 7 million people

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

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by Ronald Chén

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