HKIMO 2019 Grade 6 National Final (Heat) Set 02 Question 24

Numbers are drawn from the 129 integers 34 through 162. What is the least number of random draws that guarantees two numbers with sum 151?

Source glossary (English–Vietnamese): Integer: số nguyên; At least: ít nhất; Random: ngẫu nhiên; Ensure: chắc chắn; Sum: tổng.