Number Series - Type 1

In each series, look for the degree and direction of change between the numbers. In other words, do the numbers increase or decrease, and by how much

Look at this series: 8, 31, 122, 485, 1936,7739, ... What number should come next?

Answer: Option A

Explanation:

The series is x 4 -1, x 4 - 2, x 4 - 3, x 4 - 4, ....,

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