Discussion
Find the missing number in the series:
100, 96, 89, 79, ?
Answer: D
Correct answer: 66
The differences themselves form a pattern: \[ 100 - 96 = 4,\quad 96 - 89 = 7,\quad 89 - 79 = 10 \] each gap being 3 more than the last. The next gap is therefore 13, giving \[ 79 - 13 = \mathbf{66} \]
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