Discussion
6, 11, 21, 36, 56, ?
Answer: C
Correct answer: 81
The gaps rise by five each time: \( 11-6=5 \), \( 21-11=10 \), \( 36-21=15 \), \( 56-36=20 \). The next gap is 25, giving \[ 56 + 25 = \mathbf{81} \]
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