book Maths Puzzle Numerical Ability

Identify the binomial expansion of (x-y)^3.

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book Other Question

one glass contains 10 ounces of orange juice and a second glass contains the same amount of lemon juice. A dipper of the first is ladled into the second and throughly mixed. Then a peter wanted to draw a line parallel to the line of a window with equation y=x+2.if the line is supposed to pass through point (2,3).what is the equation of the line desired by peter.