I already informed you that there is no simple formula to give you an exact answer to these problems . Jason's solution is only said to be valid for large b , but how large does it have to be ? What is the margin of error ?
You may need to read your own thread again . It does appear that you're completely confused and out of your element .
http://forumserver.twoplustwo.com/showth...=0#Post12737174
Pzhon has told you that your argument is a mess . Even though Jason has posted an approximation formula , I don't believe you even understand anything that was written . You're an immature fool , and I've tried to help you numerous times but you're so stubborn that there is no point trying to get through to you .