+The difference between the consecutive terms is:
31-29 = 2
37 -31 = 6
49- 37 = 12
69-49 = 20
Here, the difference between the consecutive difference terms is
6-2 = 4
12-6 = 6
20-12 = 8
Hence, the next term in difference series = 10
Therefore the next term in series = 69+30 = 99
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