by taking x = 6/5,y = 3/7, z = 1/3 verifya.xxy=xx b.xx(yxz)=(xxy)xz
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(A) XXY=XX
6/5*6/5*3/7=6/5*6/5
108/175=36/25
3/7=1
3=7
(B) XX(YXZ)=(XXY)XZ
6/5*6/5(3/7*6/5*1/3)=(108/175)6/15
36/25*18/105=108/175*6/15
648/2625=648/2625
1=1
6/5*6/5*3/7=6/5*6/5
108/175=36/25
3/7=1
3=7
(B) XX(YXZ)=(XXY)XZ
6/5*6/5(3/7*6/5*1/3)=(108/175)6/15
36/25*18/105=108/175*6/15
648/2625=648/2625
1=1
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