sharank wrote:
If n is a positive integer what is the remainder when 3^n is divided by 5.
(1) n is multiple of 4
(2) n is multiple of 2
This is a value Q. So we need a definite answer.
3^n follows a pattern of the units digit repeats in an interval of every 4. i.e. units digit will be 3,9,7,1,3,9,7,1,...
Statement 1: So when 3^n is divided by 5 we get a definite answer as remainder = 1.
Statement 2: we could have a remainder of 1 or 4 hence we do not have a definite answer.
Option A is the correct answer.
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