Korean Political History II: Chapter 1, Exercise 2 — Possible Solution
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APPROACH
Both sources give 300 seats in total, so state that. For the split, report
both figures with their sources: one says 253 single-seat and 47 proportional,
the other says 254 first-past-the-post and 46 proportional. Say the difference
is unresolved and would need the National Election Commission or the Assembly's
own records.

SENTENCE
"The Assembly has 300 seats; sources differ on whether 253 or 254 are
constituency seats."