Question 13
Find the last two digits of $A=6+13+20+\cdots+(6+7\times98)+(6+7\times99)$.
HKIMO 2019 THPT (Grades 10–12 shared) National Final (Heat) Set 02 Question 13
HKIMO · HKIMO 2019 THPT (Grades 10–12 shared) National Final (Heat) Set 02
HKIMO · HKIMO 2019 THPT (Grades 10–12 shared) National Final (Heat) Set 02