Discussion
141, 122, 109, __________
Answer: B
The next number is 102.
The differences between terms shrink by 6 each time:
\[ \begin{aligned} 141 - 122 &= 19 \\ 122 - 109 &= 13 \\ 109 - 7 &= 102 \end{aligned} \]
The differences 19, 13, 7 form a pattern falling by 6. 105, 104 and 106 would need differences of 4, 5 and 3, which break it.
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