#3. How can you make your “unfair” coin fair?

Photo Credit: Pixabay

Answer:

Regardless of which side the coin lands on more often, and what the probability is that it will land on that side, one thing is always true for an unfair coin – if you flip it twice, the probability that you will get heads and then tails is the same as the probability that you will get tails and then heads.

So you either call HT or TH, and when you flip the coin twice you have four possibilities: HT, TH, HH, and TT. If you get heads twice or tails twice, you simply flip the coin two more times until you get one before the other. Which will occur first, HT or TH, is a 50/50 split, regardless of how unfair the coin is.

So if you ever find yourself in a wager with an unfair coin, make sure you remember how to level the playing field!

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