Find the remainder when 6^23 is divided by 5 ?  Choose the correct choice from the following: A) 3 B) 2 C) 1 D) 0 E) 4

Rationale: "6 ^ 23 = 6 ^ ( 4 * 5 + 3 ) = 6 ^ ( 20 ) * 6 ^ 3 last 3 digits = 216 216 / 5 remainder = 1 answer : c"
Answer: C