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Fix two small typos in exercise C.3-3#28

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appleby wants to merge 1 commit intoskanev:masterfrom
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Fix two small typos in exercise C.3-3#28
appleby wants to merge 1 commit intoskanev:masterfrom
appleby:appleby-c.3-3

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@appleby appleby commented Oct 23, 2016

Pr{X = 1} is listed twice when describing the probability density
function. The second occurrence is meant to be Pr{X = 0}.

Also, the Pr{X = 2} is given as 3(6/216) - 3(1/126) = 5/216, where
5/216 should actually be 15/216.

In both cases, the correct values already appear in the
"calculation" section near the bottom.

Pr{X = 1} is listed twice when describing the probability density
function. The second occurrence is meant to be Pr{X = 0}.

Also, the Pr{X = 2} is given as 3(6/216) - 3(1/126) = 5/216, where
5/216 should actually be 15/216.

In both cases, the correct values already appear in the
"calculation" section near the bottom.
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