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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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by Dinesh Nath Goswami

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