exam Maths Puzzle Numerical Ability

If 0 < x < 1, which of the following statements must be true?

I. x^2 > x^3
II. x > x/2
III. x > x^3

(A) I only
(B) II only
(C) I and II only
(D) I and III only
(E) I, I

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how to solve this by Q.F
(x-l)(x-m)+(x-m)(x-n)(x-n)(x-l)=o

Please reply me ok Arlene and AJ are Chemist. AJ can do an emulsion polymerization experiment in 10 hours. If AJ and Arlene work together they can do the experiment in 6 hours. How long will it take Arlene working by herself to do the experiment?