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Solution

(x1 , y1 , z1) + ( x2 , y2 , z2) = ( x1 +x2 , 2y1 , z1 +z2 )

Vector addition: x1 +x2   holds true for addition

y1 + y2 = 2y1 is does not hold true or addition

z1 +z2   = z1 +z2 holds true for addition

c(x1 , y1, z1) = 2cx1 , 2cy1 , 2cz1 hold true for scalar multiplication

Sp, V does not hold true for addition property