C1,C2 upto Cn are n cities in a country.There are some roads
connecting these cities.They are connected in such a that
Crth city has r distinct routes connecting each of the other
city in the country.
1)if n=27,then how many roads are there in a country?
2)if n=4,in how many distinct routes,can a person travel
from c3 to c2?
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