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【OG20-P158-79题】
At the start of an experiment, a certain population consisted of 3 animals. At the end of each month after the start of the experiment, the population size was double its size at the beginning of that month. Which of the following represents the population size at the end of 10 months?
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题目:某项实验开始时有3个动物,每个月结束时动物数量是开始时的两倍,问以下哪种运算表示的是10个月结束时动物的数量?
解答:假设月份为n,由题意可知第一个月结束(即第二个月开始)时动物数量是3*2,即3*21;第二个月结束时动物数量为3*2*2,即3*22,可推测第n个月结束时动物数量应该为3*2n,因此第十个月结束时动物数量为3*210.
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