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एक समांतर चतुर्भुज का क्षेत्रफल ज्ञात की...

एक समांतर चतुर्भुज का क्षेत्रफल ज्ञात कीजिए जिसकी संलग्न भुजाएं सदिश `bara = hati + hatj + 3hatk` और `barb = 3hati + 2hatj + hatk` द्वारा दी गई है |

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