In a set of 10 consecutive odd positive integers, the product of the least and the greatest integers is 63? What is the

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In a set of 10 consecutive odd positive integers, the product of the least and the greatest integers is 63? What is the arithmetic mean(average) of the set?

A. -12
B. 0
C. 8
D. 12
E. 30

Answer: D

Source: e-GMAT
Source: — Problem Solving |