if n divided by 7 has a remainder of 2 , what is the remainder when 4 times n is divided by 7 ?
"as per question = > n = 7 p + 2 for some integer p hence 4 n = > 28 q + 8 = > remainder = > 6 for some integer q alternatively = > n = 2 > 3 n = > 8 = > 8 divided by 7 will leave a remainder 1 hence a"
multiply(4, 2)