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Question
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If `vec"a", vec"b", vec"c"` are three unit vectors such that `vec"a"` is perpendicular to `vec"b"`, and is parallel to `vec"c"` then `vec"a" xx (vec"b" xx vec"c")` is equal to
Options
`vec"a"`
`vec"b"`
`vec"c"`
`vec0`
Solution
`vec"b"`
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