MediumMath and Logic
Get fair toss from biased coin.
Riddle
Get fair toss from biased coin.
Choose an answer
A.Toss it once
B.Toss it three times
C.You can't
D.Toss twice
Hint: It's a 2-word phrase with 9 letters, starting with "T".
Answer
Toss twice
Why this is the answer
If you toss twice, the probabilities of HT and TH are both (p * (1-p)). Since these are equal, assigning one to 'Heads' and the other to 'Tails' creates a fair 50/50 result.
This riddle is filed under Math Riddles and rated Medium.