Answer:
O(g(n)) is the set of functions with smaller or same order of growth as g(n).
Eg. O(n^2) includes all functions like O(1), O(n), O(n^2) and O(nlogn).Now coming to your question.
Let x, y, z be three growth rate functions.
And lets assume xRy & yRz....if with these 2 assumptions we can conclude xRz, then R is transitive...
xRy: x is same order or smaller order than y.
yRz: y is same order or smaller order than z.
Thus xRz, proved.
xRz: x is same order or smaller order than z.
For eg. You can take
x=O(1)
y=O(n)
z=O(n^2)
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