Practice problem
Find the remainder when 9×99×999×⋯×99⋯9⏟999 9’s9 \times 99 \times 999 \times \cdots \times \underbrace{99\cdots9}_{\text{999 9's}}9×99×999×⋯×999 9’s99⋯9 is divided by 100010001000. (AIME)
109
119
129
139
Type a concept, like “slope” or “photosynthesis”.
