已知数列{a n }的通项公式为a n =2 n ,数列{b n }的通项公式为b n =3n+2.若数列{a n }和{b n }的公共项顺序组成数列{c n },则数列{c n }的前3项之和为( ).
A.
248
B.
168
C.
128
D.
19
E.
以上答案均不正确
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