CMI 2019 B4: In a parallelogram ABCD, O is interior point AOB+DOC=180, prove ODC=OBC

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CMI 2019 B4: In a parallelogram ABCD, O is interior point AOB+DOC=180, prove ODC=OBC
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Sir in the examination, is it necessary to present all the steps? If not, what and all should we write down?

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