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उस समांतर चतुर्भुज का क्षेत्रफल ज्ञात की...

उस समांतर चतुर्भुज का क्षेत्रफल ज्ञात कीजिए जिसके विकर्ण `bar a =3i+j-2k` तथा `barb =i-3j+4k`है

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