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यदि \(\vec{a}=2\hat{i}-\hat{j}+2\hat{k}\) तथा \(\vec{a}=-\hat{i}+\hat{j}-\hat{k}\) हो तो \(\vec{a}+\vec{b}\) के अनुदिश मात्रक सदिश है

(अ) 1/√2(î + ĵ)
(ब) 1/√2(î + k̂)
(स) 1/2î + ĵ + k̂)
(द) इनमें से कोई नहीं

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