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Study the following information and answer the questions given below it :

A blacksmith has five iron articles $\text{A1, A2, A3, A4}$ and $\text{A5},$ each having a different weight.

1. $\text{A1}$ weighs twice as much as $\text{A2}$
2. $\text{A2}$ weighs four and a half times as much as $\text{A3}$
3. $\text{A3}$ weighs half as much as $\text{A4}$
4. $\text{A4}$ weighs half as much as $\text{A5}$
5. $\text{A5}$ weighs less than $\text{A1}$ but more than $\text{A3}$

Which of the following is the lightest in weight?

1. $\text{A1}$
2. $\text{A2}$
3. $\text{A3}$
4. $\text{A4}$