what can be the maximum number of cities in this country?

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locha

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In a country each city has two-way direct flights to maximum three other cities. If every city is reachable from every other city with at most three flights, what can be the maximum number of cities in this country?
 
locha said:
In a country each city has two-way direct flights to maximum three other cities. If every city is reachable from every other city with at most three flights, what can be the maximum number of cities in this country?
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locha said:
In a country each city has two-way direct flights to maximum three other cities. If every city is reachable from every other city with at most three flights, what can be the maximum number of cities in this country?
Click to expand...
When does this week's contest close?

By the way, have all your "questions" been contest entries that you've had other people completing for you? Like this post was this contest, this post was this contest, and this post was (a version of) this contest...?
 
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