National Intelligence Service Grade 7 Recruitment Exam

Practice session

A counter-intelligence unit investigates telephone call records among four suspects: A, B, C, and D. Over one month: - A called B 14 times and C 8 times. - B called C 12 times and D 6 times. - C called D 15 times and A 4 times. - D called B 10 times. What is the total number of pairwise calls between C and D (in either direction)?

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