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[" 11.In a quadrilateral "ABCD,AO" and "...

[" 11.In a quadrilateral "ABCD,AO" and "BO" are the bisectors of "/_A" and "/_B],[" respectively,"/_C=70^(@)" and "/_D=30^(@)" .Then,"/_AOB=?],[[" (a) "40^(@)," (b) "50^(@)," (c) "80^(@)," (d) "100^(@)]]

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