What's the expected number of times I have to roll two die until they both sum 7? – math.stackexchange.com

What's the expected number of times I have to roll two die until they both sum 7? – math.stackexchange.com

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Here is my guess: the probability of summing $7$ on two rolls is $\cfrac 16$. This means if I repeat the experiment many times I'll roll $7$ one sixth of them (approximately). So I can write down this ...

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