3,9,-1,-4,-15,问号的数字是,选项24,-75,-27,75

问题描述:

3,9,-1,-4,-15,问号的数字是,选项24,-75,-27,75
找规律,大虾速回我

答案是-75 :9是3的3倍 ,-4是-1的4倍 ,-75则是-15的5倍.是一个倍数等差数列.