12th Class
Mathematics
Sample Paper
Maths Olympiad Model Test Paper-10
question_answer
If \[a=\frac{1}{\sqrt{10}}(3\hat{i}+\hat{k})\] and \[b=\frac{1}{7}(2\hat{i}+3\hat{j}-6\hat{k}),\] then the value of\[(2a-b)\].\[\{(a\times b)\times (a+2b)\}\]is ______.