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設第一項為8 公差為8
an=a1+(n-1)d
800=8+(n-1)8
792=(n-1)8
n-1=99
n=100
每四個一個週期（像你寫的那樣
100/4=25整除
所以第一個會是你標的4
4123樹燈樹椅子（D)
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