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17 Apr 2007, 00:03
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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Hi there,
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17 Apr 2007, 00:21
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hi
My answer is 3/8 (is that an option ? didn't see the choices)
there are 3 ways for the ball to reach 2 with 1/2 probability in every
junction so:
1/2 x 1/2 x 1/2 = 1/8
1/8 + 1/8 + 1/8 = 3/8
hence my answer 3/8
My answer is 3/8 (is that an option ? didn't see the choices)
there are 3 ways for the ball to reach 2 with 1/2 probability in every
junction so:
1/2 x 1/2 x 1/2 = 1/8
1/8 + 1/8 + 1/8 = 3/8
hence my answer 3/8
17 Apr 2007, 00:59
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Quote:
The way I figured out this questions is to first calculate the number of pathways that lead to a specific cell.
Cell 1 - 1 pathway - 1/8 chance; that is, 1/2*1/2*1/2 = 1/8
Cell 2 - 3 pathways - 3/8 chance; that is, 3*(1/2*1/2*1/2)
Cell 3 - 3 pathways - 3/8 chance; that is, 3*(1/2*1/2*1/2)
Cell 4 - 1 pathway - 1/8 chance; that is, 1/2*1/2*1/2
Cell 1 + Cell 2 + Cell 3 + Cell 4 must add to 100% and they do.
So my answer is 3/8
In this case not really, if you know one you can readily spot the others. But sure, I would not do this on a real test, just case 2 - that is, only what is required. 
) 
fantastic picture / Try this:
