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One of the way to solve : 123456789 x 123456789 - 123456788 x 123456790 Put 123456789 = X So we can write it as : X^2 - [ ( X - 1 ) ( X + 1 ) ] = X^2 - X ^2 + 1 = 1

Note by Archana Kataria
2 years, 10 months ago

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