Thursday, December 15, 2011

Brain teaser series 2...

Flip the coin...
I always loved those coin tricks and wondered how it happened. While making the coin magically disappear is definitely a mind trick (will talk about that too) but the coin flipping is mathematical. Here is an easy one, I flipped two quarter-coins and immediately announced that one came out as head. What is the chance that the second coin will also be a head?


If you were in Las Vegas would you bet on head or tail for the second coin? Have fun :)

3 comments:

  1. 50%. Each event is independent of the other.
    If I had to bet, I would pick heads (just because I always pick heads, not for any probable advantage).

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  2. Well that would be really easy. If you think about it, I flipped both coins at the same time so events are no longer independent. :)

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  3. Since I flipped the coins at the same time the results are bind together and not independent.

    So possible outcomes are HH HT TH TT.

    As I already mentioned one coin is head (H), so the possible remaining outcomes are HH, HT and TH

    Based on the options there are 2 chances that is will be tails and one chance that it will be head, So Tails is a better choice (2/3) Enjoy!!

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