27. C(n, 2) = 78 a. 13 b. 15 c. 10 d. 12
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Since "Cin" is not a commonly used mathematical term, it is difficult to determine the exact operation being used. However, we can make an educated guess based on the given options. Option a: 13 Option b: 15 Option c: 10 Option d: 12 Let's try each option and Show more…
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