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[" If "vec a" and "vec b" are the vectors such that "|vec a+vec b|=sqrt(29)],[" and "vec a times(2hat imath+3hat jmath+4hat k)=(2hat imath+3hat jmath+4hat k)timesvec b],[" then possible value of "(vec a+vec b)*(-7hat imath+2hat jmath+3hat k)" is "],[[" (a) "0],[" (b) "3],[" (c) "4],[" (d) "8]]

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