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Official 2016 Paper 2 · Q10

Paper 2Logic & proof

In this question xx and yy are non-zero real numbers.

Which one of the following is sufficient to conclude that x<yx<y?

Ax4<y4x^4<y^4
By4<x4y^4<x^4
Cx−1<y−1x^{-1}<y^{-1}
Dy−1<x−1y^{-1}<x^{-1}
Ex3/5<y3/5x^{3/5}<y^{3/5}
Fy3/5<x3/5y^{3/5}<x^{3/5}

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