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?
Options:
A) 15 B) 21 C) 25 D) 30 E) 36
Total number of entries 6*6(6rows*6columns) =36   Now 6 entries are representing mileage with the city itself so subtract that =&gt; 36-6   Minimum entries required = half the Total = 30/2= 
<gadget id="calculator">30/2</gadget>
<output>15</output>
15   ANSWER:21
<result>B</result>
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?