Jack Lance on Twitter: "@mathgrant With 2 sides, the expected is 1/p+1/q-1/(p+q). With 3 sides, it is 1/p+1/q+1/r-1/(p+q)-1/(q+r)-1/(p+s)+1/(p+q+r) etc." / Twitter

With 2 sides, the expected is 1/p+1/q-1/(p+q). With 3 sides, it is 1/p+1/q+1/r-1/(p+q)-1/(q+r)-1/(p+s)+1/(p+q+r) etc.

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