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[" 29.What vector must be added to the sum of two vest "],[2hat i-3+3hat k" and "3hat i-2hat j-2hat k" so that the resultant "],[" unit vector along "Z" -axis? "],[qquad [" (a) "5vec i+vec k," (b) "-5hat i+3hat j" (c) "3hat j+5hat k," (d) "-3j+2i]]

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