Question 1
According to the pattern, fill the blank: $2,6,15,28,55,78,\_\_$.
HKIMO 2018 THPT (Grades 10–12 shared) National Final (Heat) Set 03 Question 1
HKIMO · HKIMO 2018 THPT (Grades 10–12 shared) National Final (Heat) Set 03
HKIMO · HKIMO 2018 THPT (Grades 10–12 shared) National Final (Heat) Set 03