The circle is symmetric, so place one point anywhere and ask whether the other three land in the same semicircle. Each of those 3 points independently has a 1/21/21/2 chance of landing in that half, so the probability should be (1/2)3=1/8=12.5%(1/2)^3 = 1/8 = 12.5\%(1/2)3=1/8=12.5%.
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Author(s): Marco Seiz, Tomohiro Takaki
沙特阿拉伯當局則稱，其位於海灣岸邊的最大拉斯坦努拉（Ras Tanura）煉油廠遭遇無人機企圖攻擊，並表示未造成損害或中斷。週一該廠曾因無人機引發火災而被迫部分停工。