exam Maths Puzzle Numerical Ability

How do I reduce the following to its lowest form

(y2 - 2y)/(y2-y-2)

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exam Other Question

find the altitude of an isosceles triangle with sides of 13 inches and a base of 10 inches A company ships computer components in boxes that contain 30 items. Assume that the probability of a defective computer component is 0.2. Use the geometric variance to find the variance of the defective parts.