For which of the following expressions is x – y a factor?I.y3 – x3II.(x2 – y2)5III.x3 – 3x2y + 3xy2 – y3

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For which of the following expressions is <em>x</em> – <em>y</em> a factor?<br>I.<em>y</em><sup>3</sup> – <em>x</em><sup>3</sup><br>II.(<em>x</em><sup>2</sup> – <em>y</em><sup>2</sup>)<sup>5</sup><br>III.<em>x</em><sup>3</sup> – 3<em>x</em><sup>2</sup><em>y</em> + 3<em>xy</em><sup>2</sup> – <em>y</em><sup>3</sup>