题目

I got the right answer, but (actual) I didn't know it. 答案：【1】actually数列{an}中，已知对任意n∈N*，a1+a2+a3+…+an=3n-1，则a12+a22+a32+…+an2等于（ ）A．（3n-1）2B．C．9n-1D．