The points A A\,A and B B\,B have position vectors (−351)\begin{pmatrix} -3 \\ 5 \\ 1 \end{pmatrix}−351 and (147)\begin{pmatrix} 1 \\ 4 \\ 7 \end{pmatrix}147 respectively.
Find the exact length of ABABAB.
42 exam-style questions on OCR A Level Maths 1.10.2 Vectors in three dimensions (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.