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A problem by Pankaj Joshi

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Pointing to a person, a man said to a woman, "His mother is the only daughter of your father." How was the woman related to the person?

Aunt Daughter Mother Wife

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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 6 million people

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

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by Pankaj Joshi

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