What is the next number in the following sequence?

　　What is the next number in the following sequence?　　1 – 2 – 3 – 5 – 8 – 13 答案：21，序列中每一个数字都是前两个数字的和，最后的两

　　What is the next number in the following sequence?

　　1 – 2 – 3 – 5 – 8 – 13

答案：21，序列中每一个数字都是前两个数字的和，最后的两个数是8和13，因此下一个数就是8与13的和。