Number Series Explanation 4 - Two Intertwining Patterns
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Example 3
This is a difficult example. It is clear that there cannot be a monotonous or exponential relationship, because the numbers do not keep getting bigger or smaller. There also does not seem to be an alternating pattern. Check whether two series are intertwined. Since the numbers increase fairly evenly, draw the addition/subtraction arches.
The second series does not always have the same transformation. First + 3, then +6, then +9 and then + 12. The answer is 25.
Tip: If a question contains more than 6 numbers, the chances of one of the more difficult patterns are higher. In general, you don’t have to look for these kinds of difficult patterns if only 5 numbers are given, because then it is not possible to find the pattern.