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Is there a simple form for the probability of rolling at least $n$ on $k$ 6-sided dice? Of course you can do it by recursion (see here). But is there a way to do it with just a few binomial coefficients, without the recursion?

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If you're willing to sacrifice accuracy, you can use the normal approximation, if $k$ is large. There isn't much alternative apart form doing the calculation. –  Calvin Lin Jan 27 '13 at 19:18

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