if n divided by 7 has a remainder of 2 , what is the remainder when 2 times n is divided by 7 ?
"as per question = > n = 7 p + 2 for some integer p hence 2 n = > 14 q + 4 = > remainder = > 4 for some integer q alternatively = > n = 2 > 2 n = > 4 = > 4 divided by 7 will leave a remainder 4 hence d"
multiply(2, 2)