A perfect dice is drawn $4$ times.What's the probability to the same number comes out at least $2$ times?
At first, I applied to binomial law.I made all calculations.
I set up a random variable.The possible values for the variable were $0,1,2,3$ and $4$. My thought was that any number have a probability of $\frac{1}{6}$ to come out.
Then I started to think.In the $4$ launchs two different numbers can come out $2$ times, each one.So my previous thoughts were wrong.
Can you give me an idea on how to solve this problem?