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A problem by Pankaj Joshi

Level pending

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

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, conceptual quizzes.

Our wiki is made for math and science

Master advanced concepts through explanations,
examples, and problems from the community.

Used and loved by 4 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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