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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).
