so
also, if A or B happens but not both, you add the chances and subtract the chance that both are happening.
a hiker walks 6km uphill along a trail, then returns downhill along the same trail. the hikers average speed is 2km/h greater on
the downhill journey. write a simplified rational expression for the total time spent hiking un terms of average speed uphill, v km/h
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so
also, if A or B happens but not both, you add the chances and subtract the chance that both are happening.
