Observe the following examples:
Consider the integers -3,-2 and -5.
Look at (-5)+((-3) + (-2)] and [(-5)+(-3)] +(-2).
In the first sum (-3) and (-2) are grouped together and in the second (-5) and (-3)
are grouped together. We will check whether we get different results.
(-5) + (-3)
(-2)
(-3) + (-2)
-10
-8
-5
-10
[(-5)+(-3)] +(-2)
(-5) + [(-3) + (-2)]
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