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１９８１年，轰动世界的“人机比赛”在印度举行．参赛者是一位名叫沙贡塔娜的３７岁的印度妇女．她要以惊人的心算能力与一台先进的电子计算机进行比赛．比赛大厅人头攒动，座无虚席．主持人走上讲台，简短的致词后，在黑板上写下了一个２０１位的大数：９１６７４８６７９２?
In 1981, the sensational “man-machine game” was held in India. The contestants were a 37-year-old Indian woman named Shagontana. She wants to compete with a state-of-the-art computer with amazing mental arithmetic. The game hall is full of people and is full of seats. The host walked onto the podium. After a short speech, he wrote a 201-digit number on the blackboard: 9647487896?