(New page: it probably will be obvious for most of you guys,but just in case.... for part a), after we take the drivitive we get something like: <math> 4*q^3*(1-q)^6-6*(1-q)^5*q^4=0</math> you ma...) |
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then we can easily find q=6/10 | then we can easily find q=6/10 | ||
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| + | for part two we can divide both side with: | ||
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| + | <math> (1-q)^{k-1}*q^{n-k-1}</math> | ||
| + | then we get: | ||
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| + | <math> q=(n-k)/n</math> | ||
Revision as of 09:07, 3 November 2008
it probably will be obvious for most of you guys,but just in case.... for part a), after we take the drivitive we get something like:
$ 4*q^3*(1-q)^6-6*(1-q)^5*q^4=0 $
you may try to solve it this way: divide both side by q^3 and (1-q)^5, thus we get:
$ 4*(1-q)-6*q=0 $
then we can easily find q=6/10
for part two we can divide both side with:
$ (1-q)^{k-1}*q^{n-k-1} $ then we get:
$ q=(n-k)/n $
