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एक समान्तर चतुर्भुज का क्षेत्रफल ज्ञात क...

एक समान्तर चतुर्भुज का क्षेत्रफल ज्ञात कीजिए जिसकी संलग्न भुजाएं सदिशों `bara = hati + hatj + 3hatk` तथा `barb = 2hati + 7hatj + hatk` द्वारा निर्धारित है |

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