Number Series - Type 4

Find the number that fits somewhere into the middle of the series. Some of the items involve both numbers and letters

Look at this series: 70, 71, 76, __, 81, 86, 70, 91, ... What number should fill the blank?

Answer: Option A

Explanation:

In this series, 5 is added to the previous number; the number 70 is inserted as every third number.

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