What comes next in these sequences: 1, 11, 31, 71, _____?
- 151
- 291
- 311
- 411
Explanation
The sequence is formed by adding 10, then 20, then 40, and so on, increasing the increment by 10 each time:
1 + 10 = 11
11 + 20 = 31
31 + 40 = 71
71 + 80 = 151
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