In \( \triangle ABC \), \( DE \parallel BC \), \( \frac{AD}{DB} = \frac{2}{3} \) and \( AC = 2.5 \text{ cm} \), then \( AE = \_\_\_\_\_ \text{ cm}\).
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Whenever ratios like \(2:3\) are given, convert them into parts immediately. Here total parts become \(2+3=5\), making proportional calculations much easier.