A.1             B.4                 C.5                  D.6

A．1               B．4               C.5                    D．6

已知数列{a_n}是等差数列，且a₃+a₁₁=50，又a₄=13，则a₂等于

1. A.
   1
2. B.
   4
3. C.
   5
4. D.
   6

A.1              B.3           C.5            D.7