Question

Let a→=2iˆ−jˆ+kˆ,b→=iˆ+2jˆ−kˆ and c→=iˆ+jˆ−2kˆ be three vectors. A vector of the type b→+λc→ for some scalar λ, whose projection on a→ is of magnitude 23−−√ is

Answer 1

Answer:

a= 3

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