If a × b = a × c then correct statement is

Mathematics · JEE Main · NTA Exams — Three Dimensional Geometry

1. = 0
2. = 0 = \(\stackrel{\rightharpoonup}{\mathrm{c}}\)
3. \(\overrightarrow{\mathrm{b}}\) = \(\stackrel{\rightharpoonup}{\mathrm{c}}\)
4. above three are not necessary

Answer

(D) above three are not necessary

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