Question

What's the difference between fair and unfair coin?

Answer 1

Fair basically means having an honest way of getting choosen

and unfair in opposite of fair ...

fair coin contains 50% probability of both .

and an unfair does not contain exact 50%

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Answer 2

A fair coin has an exactly equal chance of landing heads or tails face up when flipped. 

An unfair coin is one that has been tampered with in some way to give a greater chance to either heads or tails being the outcome of a flip. A trick coin, if you will.