单项选择题

If a and b are integers and a-b=6，then a+b CANNOT be（）

A. 0
B. less than 6
C. greater than 6
D. an even integer
E. an odd integer

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单项选择题

Which of the following numbers is NOT the sum of three consecutive odd integers（）

A. 15
B. 75
C. 123
D. 297
E. 313

单项选择题

11×13×17×19×23A decrease of 1 in which of the factors above would result in the greatest decrease in the product（）

A. 11
B. 13
C. 17
D. 19
E. 23

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