You have two magic pills. One increases your life span by 10% and the other decreases it by 10%. You don't know which pill is which. You take one of the pills. But then you start to worry, so you take the other one to counteract it. Will you now have a normal life span?
Answer:
No......... 1.1 X 0.9 = 0.99
You've lost 1%.
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