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[" 98.The vector "b=3j+4k" is to be written as the sum "],[" of a vector "b_(1)" parallel to "a=i+j" and a vector "b_(2)],[" perpendicular to "a" .Then "b_(1)" is equal to "],[[" (a) "(3)/(2)(i+j)," (b) "(2)/(3)(i+j)],[" (c) "(1)/(2)(i+j)," (d) "(1)/(3)(i+j)]]

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