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Need solution for RD sharma maths class 12 chapter 24 vector or cross product Exercise Multiple choice questions question 17 maths textbook solution

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Answer: two

Given: \vec{a}=2 \hat{i}+\hat{j}+2 \hat{k} ; \vec{b}=\hat{j}+\hat{k}

Hint: You must know about unit vector perpendicular to the vectors                        

Explanation: \vec{a}=2 \hat{i}+\hat{j}+2 \hat{k} ; \vec{b}=\hat{j}+\hat{k}                                         

            Unit vector perpendicular to both \vec{a} & \vec{b}can              

           be drawn in two direction.    

                        i.e., upward or downward

                       i.e., \vec{a}\times \vec{b}and -\left ( \vec{a}\times \vec{b} \right )                                                                     

            \because No of vectors is two

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