Dice toss simulator

I got a question on Facebook about probability when rolling dice. It was my friend son who had this in his home task.

The case was as follow:
To test if the calculation was correct, I made a simulation in JavaScript. To get statistically significant data I found that I had to run 2000 tosses. To be able to follow the progress I am using the 'setInterval()' set to run every 20 milliseconds.
It confirmed the theory.

Equal Equal and 1

# dice tosses:


equal AND one:

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