In the table above, what is the least number of table entries that are needed to show the mileage between each city and

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A

B

C

D

E

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In the table above, what is the least number of table entries that are needed to show the mileage between each city and each of the other five cities?

(A) 15
(B) 21
(C) 25
(D) 30
(E) 36

Answer: A

Source: Official Guide