Verify that a+(b+c)=(a+b)+c for a =-1/5,b=-2/3 and c=1/3
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a= -1/5 , b = -2/3 , c = 1/3
therefore a + (b + c) = -1/5 + (-2/3 + 1/3) = -1/5 - 1/3 = -3 -5 / 15 = -8/15
(a + b) + c = (-1/5 -2/3) + 1/3 = (-3 - 10/15) + 1/3 = -13/15 + 1/3 = -13 + 5 /15 = -8/15
hence verified
therefore a + (b + c) = -1/5 + (-2/3 + 1/3) = -1/5 - 1/3 = -3 -5 / 15 = -8/15
(a + b) + c = (-1/5 -2/3) + 1/3 = (-3 - 10/15) + 1/3 = -13/15 + 1/3 = -13 + 5 /15 = -8/15
hence verified
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