take the average no. of teams in past 100y: N
odds of them going back-to-back in '17/'18 are
~ 0.5 * [ N^2 / (N - 1) ]^2
then either not winning for 87y, you have to multiply by
~ [ N / ( N -2 ) ]^87
& then you finally multiply by first formula again ( as they've gone back to back again )
i can try to simplify it later
whoops ! now it's ~ 470,000,000 to 1
i give up

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