Found this weird sequence: $$8110423, 259974, 9814143, 5512166, 113322, ?$$

The possible answers are:

a) $334455$, b) $7911132$, c) $9841233$, d) $872236$.

The correct answer is b), but I can't figure out why, and no explanation was given. Any ideas?


The sum of first two digits and the last two digits as a two digit addition gives the rest of the number (middle).

  • 3
    $\begingroup$ I see. It is not a sequence, it is a common property you were looking for. $\endgroup$ – Florian F Jul 10 '20 at 22:16

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