已知某商场新进3000袋奶粉,为检查其三聚氰胺是否达标,现采用系

已知某商场新进3000袋奶粉,为检查其三聚氰胺是否达标,现采用系统抽样的方法从中抽取150袋检查,若第一组抽出的号码是11,则第六十一组抽出的号码为               .

答案

解析:每组袋数:,由题这些号码是以11为首项,20为公差的等差数列

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