5, 25, 20Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.
What comes next in this series?
5, 25, 20, 400, 380 ...
The series is as follows:
number, squared number, squared number minus number, squared number minus number squared... etc.
5 (x5), 25 (-5), 20 (x20), 400 (-20), 380 (x380), 144400.
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