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[" Question: Let "vec a=hat i-2hat j+hat...

[" Question: Let "vec a=hat i-2hat j+hat k,vec b=hat i-hat j+hat k" and "vec c" is nonzero vector and "vec b timesvec c=vec b timesvec a],[vec a*vec c=0." find "vec b.vec c.],[" Options: "],[" Options: "],[" (b) "(1)/(2)],[" (b) "(1)/(3)],[" (c) "(-1)/(2)],[" (d) "(-1)/(3)]

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