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02 Aug 2003, 17:15
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This one has been done before :
A coin is flipped 5 times. What is the probability that there are at least 3 heads ?
A coin is flipped 5 times. What is the probability that there are at least 3 heads ?
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03 Aug 2003, 10:54
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10C3+5C1+1C1
---------------------=16/32=1/2
32
Or
at least 3 means 3, 4, and 5 heads
the opposite cases are 0, 1, and 2 heads
the rule of symmetry gives 3/6=1/2
---------------------=16/32=1/2
32
Or
at least 3 means 3, 4, and 5 heads
the opposite cases are 0, 1, and 2 heads
the rule of symmetry gives 3/6=1/2
Spend more time with algebra and geometry, why are we all obsessed about probability 
