We know that *pi* (one of the famous mathematical constants, and not that pastry) is an irrational number, that is can’t be expressed as a fraction *x/y*, where *x* and *y* are integers and *y* are non-zero. Yet *pi* can be expressed as 22/7. Contradiction? Please take a look at these interesting readings:

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22/7 is an approximation, isn’t it?