What is the remainder when 8^1 + 8^2 + 8^3 +...+ 8^9 is divided by 8?
Choose the correct answer:
A) 4
B) 0
C) 2
D) 5
E) none of the above

Rationale: "notice that in the brackets we have the sum of 9 even multiples of 8 , which yields remainder of 0 upon division by 8 . answer : b"
Answer: B