If a whole number n is divided by 4, we will get 3 as remainder. What will be the remainder if 2n is divided by 4 ? Choose the correct choice from the following answers.
A) 4  B) 3  C) 2  D) 1  E) 0

Rationale: explanation : let n ÷ 4 = p , remainder = 3 = > n = 4 p + 3 2 n = 2 ( 4 p + 3 ) = 8 p + 6 = 8 p + 4 + 2 = 4 ( 2 p + 1 ) + 2 hence , if 2 n is divided by 4 , we will get 2 as remainder . answer : c
Answer: C