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A B C D is a parallelogram. P is any ...

`A B C D` is a parallelogram. `P` is any point on `C Ddot` If `a r\ ( D P A)=15\ cm^2\ ` and `a r\ ( A P C)=20 c m^2,` then `a r\ ( A P B)=`
(a) `15 c m^2` (b) `20 c m^2` (c) `35\ c m^2` (d) `30 c m^2`

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