单项选择题
A.1800 B.60 C.1200 D.log23600
A.65,15,37 B.68,30,37 C.65,15,30 D.65,15,30,37
A.e B.2e C.n2-e D.n2-2e
A.n B.n*(n-1) C.n*(n+1) D.n*n
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