1.

If a = 2i + k, b = I + j + k, c = 4i - 3j + 7k. The vector r satisfying r xx b = c xx b and r.a = 0 is

Answer»

I +8J + 2K
I - 8j + 2k
`-1 - 8j + 2k`
I - 8j - 2k

Answer :C


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