In \( \triangle \mathrm{ABC}, \mathrm{D} \) is a point on side \( \mathrm{BC} \). If \( \mathrm{...

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In \( \triangle \mathrm{ABC}, \mathrm{D} \) is a point on side \( \mathrm{BC} \). If \( \mathrm{AC}=3 \mathrm{~cm} \), \( \mathrm{AD}=3 \mathrm{~cm}, \mathrm{BD}=8 \mathrm{~cm} \) and \( \mathrm{CD}=1 \mathrm{~cm} \), then \( \mathrm{AB} \) is?
a. \( 5 \mathrm{~cm} \)
b. \( 6 \mathrm{~cm} \)
c. \( 7 \mathrm{~cm} \)
d. \( 9 \mathrm{~cm} \)
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