CAT Quantitative Ability Questions | CAT Permutation, Combination and Probability questions
CAT/2003
Question . 33
There are 12 towns grouped into four zones with three towns per zone. It is intended to connect the towns with telephone linessuch that every two towns are connected with three direct lines if they belong to the same zone, and with only one direct lineotherwise. How many direct telephone lines are required?
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