Khan/khan-exercises — Issue #7003: Probability 1 - EXplanation/Hint = No Mathematical Reasoning
Author: KhanBugz
Created: 2011-11-24 02:14:55+00:00
State: open
Labels: hard, ie8, ie9, win7

Reporter: msapathy@yahoo.com

I want to know why other than making a chart to prove.
I know how to make a chart to prove it, but I need and want to know why without making a chart.

If the question said, "If you were to flip a fair coin 100 times..." I would not know how to do it. I cannot even explain how to do it mathematically with just 3 or 4 flips. I need to make a chart to figure that out.
the video helps, but only to a certain extent.

I sometimes use the hints to have a step-by-step explanation to know more as to "why".
So, instead of having a chart explanation, please explain using mathematical reasoning.

For example:

2x4=8
II II II II <- chart explanation

2x4=8
2+2+2+2 = 8 <- mathematical reasoning

So.. I cannot do this until I can see why withouta chart explaining to me where the numbers come from.
If you cannot explain it mathematically then there is a serious issue.

[probability_1.html?seed=111&problem=2](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/probability_1.html?seed=111&problem=2&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/probability_1.html?seed=111&problem=2&debug&activity=%5B%5D)

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