Discussion
Choose the number pair which is different from others.
Answer: B
The odd pair is 5 : 115.
In each pair the second number is \(n^3 - n\), where \(n\) is the first number:
\[ \begin{aligned} 4^3 - 4 &= 64 - 4 = 60 \\ 6^3 - 6 &= 216 - 6 = 210 \\ 7^3 - 7 &= 343 - 7 = 336 \\ 5^3 - 5 &= 125 - 5 = 120 \end{aligned} \]
The pattern needs 5 : 120, so 5 : 115 is the pair that breaks it.
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