In the following questions numbered 1 to 20, a question is followed by data in the form of two statements labelled as I and II You have to decide whether the data given in the statement is sufficient to answer the questions.

Question 2

What is $$a : b : c$$ ?
I. $$a^{2} + 4b^{2} = 4ab$$
II. $$a^{2} + 5b^{2} + 4c^{2} = 4b(a+c)$$

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