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If vector PR = vector(2i + j + k), vector QS = vector(-i + 3j + 2k), then the area of the quadrilateral PQRS is … (a) 5√3

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If vector PR = vector(2i + j + k), vector QS = vector(-i + 3j + 2k), then the area of the quadrilateral PQRS is …

(a) 5√3

(b) 10√3

(c) 5√3/2

(d) 3/2

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Answer is (c) 5√3/2

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