CAT Quantitative Ability Questions | CAT Permutation, Combination and Probability questions

CAT/2005

Question . 16

Three Englishmen and three Frenchmen work for the same company. Each of them knows a secret not known to others. Theyneed to exchange these secrets over person-to-person phone calls so that eventually each person knows all six secrets. None ofthe Frenchmen knows English, and only one Englishman knows French. What is the minimum number of phone calls needed forthe above purpose?

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Method of solving this CAT Quantitative Ability Question from Permutation, Combination and Probability question