Knights Around A Table

25 of King Arthur's knights are seated at the round table. Three of them are randomly chosen to be sent off to slay a troublesome dragon. Let \(P\) be the probability that at least two of the three had been sitting next to each other. If \(P\) can be expressed as \(\frac {a}{b}\), where \(a\) and \(b\) are pairwise coprime integers, find \(a+b\).

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