# Thread: Probability of throwing "too many" 1's

1. ## Probability of throwing "too many" 1's

Hello

Suppose I have a 6-sided, honest dice. I throw this dice 18 times and get the value 1 4 times.
How do I calculate the probability of this happening?

2. ## Re: Probability of throwing "too many" 1's

The number of 1's rolled out of 18 rolls is binomially distributed with parameters $n=18,~p=\dfrac 1 6$

$P[4] = \dbinom{18}{4}\left(\dfrac 1 6\right)^4 \left(\dfrac 5 6\right)^{18-4} = \dfrac{518798828125}{2821109907456} \approx 0.1839$