- #1
Addez123
- 199
- 21
- TL;DR Summary
- When rolling a dice 20 times, whats the probability of getting 6 k amount of times?
The probability should be
## (1/6)^k * (5/6)^{20-k} ##
But the book says the answer is :
##
\begin{pmatrix}
20 \\
k \\
\end{pmatrix} * (1/6)^k * (5/6)^{20-k} ##
Because there are 20 over k different sequences, but the order doesn't matter?
I just don't understand why the 20 over k is there at all.
## (1/6)^k * (5/6)^{20-k} ##
But the book says the answer is :
##
\begin{pmatrix}
20 \\
k \\
\end{pmatrix} * (1/6)^k * (5/6)^{20-k} ##
Because there are 20 over k different sequences, but the order doesn't matter?
I just don't understand why the 20 over k is there at all.