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.
What is the first number in the 10th row of the array shown?
Continue the consecutive positive odd numbers, with row lengths 1, 3, 5, 7, … as displayed.
What is the first number in the 10th row of the array shown?
Continue the consecutive positive odd numbers, with row lengths 1, 3, 5, 7, … as displayed.