Question 1
SEAMO self-study edition 2027; not an official 2027 paper. Original source years are retained. 25 questions, 90 minutes; Q1–10: 3 points, Q11–20: 4 points, Q21–25: 6 points, total 100. Original response types and all subparts are preserved. Verified is an editorial convention; source defects, necessary assumptions and unresolved mathematical uncertainty are disclosed.
Each figure below was formed by surrounding the black squares with white squares. How many white squares will surround one row of 50 black squares?
Each figure below was formed by surrounding the black squares with white squares. How many white squares will surround one row of 50 black squares?