Consider the first 10 positive integers. If we multiply each number by -1 and then add 1 to each number, the variance of the numbers so obtained is
The first 10 positive integers are 1 ,2,3,4,5,6,7,8,9 and 10.
On multiplying each number by -1, we get
-1, -2, -3,4, -5, -6, -7, -8, -9, -10
on adding 1 to each number , we get
.