p[of tossing nine coins and getting 7H and 2T] $\displaystyle 9C7*.5^9*.5^2$ This equation doesn't yield the correct answer. What is wrong?
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Originally Posted by dwsmith p[of tossing nine coins and getting 7H and 2T] $\displaystyle 9C7*.5^9*.5^2$ This equation doesn't yield the correct answer. What is wrong? Why is 9 your first power of 0.5?
$\displaystyle nCr*.5^n*.5^{n-r}$
Originally Posted by dwsmith $\displaystyle nCr*.5^n*.5^{n-r}$ Check your formula!!!!
The book sucks don't have one. I had to find that online.
Originally Posted by dwsmith The book sucks don't have one. I had to find that online. You've either gone to a dodgy site or copied it down incorrectly. Your first power of 0.5 should be r not n.
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