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3 groups of 7 numbers each are made from positive integers from 1 to 21, inclusive. What is the highest...

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A

B

C

D

E

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Source: E-GMAT

3 groups of 7 numbers each are made from positive integers from 1 to 21, inclusive. What is the highest possible median of the medians of these 3 groups?
A. 10
B. 11
C. 12
D. 14
E. 17.5

The OA is D