单项选择题

LEAGUE RESULTS

According to the incomplete table above．If each of the 6 teams in the league played each of the other teams exactly twice and there were no ties．How many games did team X win(Only 2 teams play in a game．)（）

 

A. 4
B. 5
C. 6
D. 7
E. 10

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单项选择题
If a1，a2，a3，…an…is a sequence such that a1=-2 and an+1 is the reciprocal of the square of an for all n≥1，what is the value of a4（）

A.A
B.B
C.C
D.D
E.E
单项选择题
What was the median number of errors in the sample（）

A. 3
B. 3.5
C. 4
D. 4.5
E. It cannot be determined from the information given．
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