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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- Apr 17th 2010, 05:27 PMdwsmith9 coins: 7H and 2T
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? - Apr 17th 2010, 05:30 PMDebsta
- Apr 17th 2010, 05:31 PMdwsmith
$\displaystyle nCr*.5^n*.5^{n-r}$

- Apr 17th 2010, 05:40 PMDebsta
- Apr 17th 2010, 05:40 PMdwsmith
The book sucks don't have one. I had to find that online.

- Apr 17th 2010, 05:43 PMDebsta