Flip a coin pt. 2 (Simple...)

Probability Level 2

I have four coins. All of them are completely fair and have two sides which are heads and tails. I flip each one consecutively once. What is the probability that I get all of them heads, or all of them tails?

8% 50% 6.25% 25% 12.5% 5%

Muhammad Zeeshan Zaman by Muhammad Zeeshan Zaman , 22, United Kingdom

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2 solutions

Kyle T
Feb 25, 2019

2 / 2^4 = 1/8 = 12.5%

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Heads or tails on each coin is 50%. In other words - 1/2. To get it on all coins (either heads or tails as they have the same probability separately), you perform the calculation 1/2 x 1/2 x 1/2 x 1/2. You get 1/16. Then you perform 1/16 x 2 = 2/16 = 1/8. This is equivalent to 0.125. This is the same as 12.5%

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