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In DeltaABC, D and E are points on sides...

In `DeltaABC`, D and E are points on sides AB and AC respectively such that `DE||BC`. If AE=1.8cm, BD= 7.2cm and CE= 5.4cm, then the length of AD is

A

3.6cm

B

2.8cm

C

2.4cm

D

1.8cm

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