Abhay's Math
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Illustration 1 :
1ab + 2cd = 3a + 4b + 5c + 6d + 7
2(1a - 4)(1b - 3) + 1(2c - 6)(2d - 5) = 1*5*6 + 2*3*4 + 1*2*7
Illustration 2 :
2ab + 3cd = 4a + 5b + 6c + 7d + 8
3(2a - 5)(2b - 4) + 2(3c - 7)(3d - 6) = 2*6*7 + 3*4*5 + 2*3*8
I hope you have understood the illustrations.
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