CAT 2000 QA Question

Instructions

Directions for the next 3 questions: For three distinct real positive numbers x, y and z, let

f(x, y, z) = min (max(x, y), max (y, z), max (z, x))

g(x, y, z) = max (min(x, y), min (y, z), min (z, x))

h(x, y, z) = max (max(x, y), max(y, z), max (z, x))

j(x, y, z) = min (min (x, y), min(y, z), min (z, x))

m(x, y, z) = max (x, y, z)

n(x, y, z) = min (x, y, z)

Question 115

Which of the following is necessarily greater than 1?

Solution


From the given functions we can make out that function h and m give max value , function n and j give min value , function f and g give middle  value. From this equation (f(x, y, z) + h(x, y, z)-g(x, y, z))/j(x, y, z) , numerator is always max value and denominator is min value . So this will always be greater than 1 .

Suppose x>y>z

f(x,y,z) = y

g(x,y,z) = y

h(x,y,z) = x

j(x,y,z) = z

Option d = x/z >1


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