# 9 coins 9 heads probability

Printable View

• April 17th 2010, 04:43 PM
dwsmith
9 coins 9 heads probability
p[of tossing nine coins and getting all heads] = $nCr*p^n*q^{n-r}=9C9*.5^9=.001953125$

Is this correct?
• April 17th 2010, 04:48 PM
TKHunny
If they are fair coins, you have it.