Posted by **Ken** on Monday, October 19, 2009 at 11:11pm.

Twelve couples, who live in the Happy

Retirement Villa, decide to install intercom systems between each of their 12 suites. How many connecting lines are necessary to permit direct conversation between any suites?

(a) 2 couples

(b) 3 couples

(c) 4 couples

(d) 5 couples

Thank you

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