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A man has been prescribed 10 pills. Starting today, he must take one pill a day, but because the concentration of the medicine is different in each pill, he must take them in a specific order. Since the pills all look the same, the man has decided to write numbers on each pill to help him remember the order he needs to take them in.
How many pills does he have to number if he wants to keep track of the order?
What conditions will allow you to get away with labeling fewer than all 10 pills?
Since the man has to start taking his medicine today, the first thing he should do is take today's pill. Next, he should label the pills for days two through nine. If he does this, he shouldn't have to label the pill for the last day; it will be the only one without a label.
He only needs to label eight pills.
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