Heads? Or tails? We’ve all flipped a coin to settle a dispute, but is there really an equal chance that it will be heads or tails? Let's find out!

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Did you ever flip a coin to resolve a disagreement or make a decision? Sometimes we entrust a coin with important decisions. We leave the decision to chance, believing the coin has an equal probability of landing heads up or tails up.

But why are we so sure the coin is fair?

What if we flip a coin 10, 100 or even 1000 times in a row? Will we really get the equal number of heads and tails? Or, in math terms, are heads and tails equiprobable*?

Scholars have been trying to answer that question for many years. In the early 20th century, a prominent British mathematician, Karl Pearson, took the trouble to toss a coin 12,000 times!