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Deceptive looks

Algebra Level 1

If a=1000, b=100, c=10, d=1.

Evaluate: (a+b+c-d)+(a+b-c+d)+(a-b+c+d)+(-a+b+c+d)=?

2222 1010 11010 1111 9999

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Excel in math and science

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It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

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including olympiad champions, researchers, and professionals.

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by Dinesh Nath Goswami

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