6,7,8,13,15,21,( ),36
2023-06-10
A. 27
B. 28
C. 31
D. 35
参考答案:B
B. 28
C. 31
D. 35
参考答案:B
解题指导: 观察可得,此数列从第四项开始,第N项数值都等于第N-3和第N-2项的和,如13=6+7,21=8+13,所以可得第七项应该为第四和第五项之和,即13+15=28。故答案选B。
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