Cho dãy $a_{n}$ : $a_{0} =0, a_{1}=1, a_{2}=2, a_{3}=6, a_{n+4}=2a_{n+3}+a_{n+2}-2a_{n+1}-a_{n}$. CMR: $a_{n}\vdots n \forall n$
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Posted 14-01-2014 - 20:14
buitudong1998
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