单项选择题

What is the greatest positive integer n so that 2”is a factor of 12¹⁰（）

A. 10
B. 12
C. 16
D. 20
E. 60

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单项选择题

How many positive integers less than 20 are equal to the sum of a positive multiple of 3and a positive multiple of 4（）

A. Two
B. Five
C. Seven
D. Ten
E. Nineteen

单项选择题

If the range of the six measurements 140，125，180，110，165，and x is 80，which of the following could be the value of x（）

A. 60
B. 85
C. 190
D. 220
E. 245

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