no 3 dan 4 tolong djawab ya...serta cara kerjanya...please ...lusa dikumpul

3. a) P = {-5,-4,-3,-2,-1,0,1,2,3,4,5}
Q = {-8,-7,-6,-5,-4,-3,-2,-1,0,1,2}
R = {-2,-1,0,1,2,3,4,5,6,7,8}
S = {-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10}
b) PUQ
={-5,-4,-3,-2,-1,0,1,2,3,4,5} U {-8,-7,-6,-5,-4,-3,-2,-1,0,1,2}
= {-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5}
PUR
= {-5,-4,-3,-2,-1,0,1,2,3,4,5} U {-2,-1,0,1,2,3,4,5,6,7,8}
= {-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8}
QUR
= {-8,-7,-6,-5,-4,-3,-2,-1,0,1,2} U {-2,-1,0,1,2,3,4,5,6,7,8}
= {-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8}

Yang satu lagi gak keliatan... semoga membantu