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已知数列{an}是公比为的等比数列,{bn}是公差为2的等差数列,其首项分别为a1和b1,且a1+b1=3,a1>b1,且a1和b1都是正整数,则数列{an}的前十项和为
A.2046
B.62+1
C.1023
D.31+1