Money won from internet gamblers helped Atlantic City’s casinos post a 1.7 percent increase in revenue in October. Without the $20.5 million that online gambling brought in, the city’s seven casinos would have seen their revenue decline by 0.3 percent last month. The casinos took in $206.3 million in October, up from $203 million in October 2016. The Borgata was the only casino to post a monthly decline, down 7.4 percent to $59.4 million, which was still far more than any other Atlantic City casino won. It attributed the decline to customers having a particularly lucky month at table games. The Golden Nugget was up 17.5 percent to $24.2 million; Caesars was up 9.5 percent to $25.7 million; Resorts was up 4.7 percent to just under $15 million; Harrah’s was up 3.5 percent to $30.3 million; Bally’s was up 1.7 percent to $16.8 million, and the Tropicana was up 0.5 percent to $28.1 million.