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Marco gives Maria $1

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by sanju09 » Sat Feb 21, 2009 4:46 am
Marco and Maria toss a coin three times. Each time a head is obtained, Marco gives Maria $1. Each time a tail is obtained, Maria gives Marco $1. What is the probability that after the 3 tosses, Marco has $1 less than he did before the 3 tosses?

Produce your own response, links :)
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by Alpturk » Sat Feb 21, 2009 1:54 pm
probably the answer is 3/8 according to the my calculations.
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by BuckeyeT » Sat Feb 21, 2009 4:22 pm
3 flips, need 2 heads

Possible 2 head combinations/ total combinations =
3C2/(2^3) = 3/8.
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