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

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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
单项选择题
In the sum above．if X and Y each denote one of the digits from 0 to 9，inclusive，then X=（）

A. 9
B. 5
C. 3
D. 1
E. 0
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