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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? 15 21 25 30 36

Re: Interpretation of Table [#permalink]
15 Feb 2011, 20:32

1

This post received KUDOS

Other than using combinations, you could see the chart has 6*6 = 36 entries. Diagonal is the distance from A to A, B to B etc so we can remove 6, leaving 30. Each has a duplicate so divide by 2 = 15

Re: Interpretation of Table [#permalink]
19 Apr 2011, 19:16

Easy way to go about this problem is we have 6*6 = 36 enteries in table the least number of enteries would be (36 - 6) /2 since 6 enteries represent the distances between same points .

Alternatively this can be solved as combination problem.

Correct Answer A

gmatclubot

Re: Interpretation of Table
[#permalink]
19 Apr 2011, 19:16

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