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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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
单项选择题
If the sum of five consecutive even integers is 70，what is the value of the greatest of the five integers．（）

A. 12
B. 14
C. 18
D. 20
E. 22
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