Hi,

I need some help in finding the sum of the factors of 18000 which are multiple of 8 but are not multiple of 25

i proceeded as below.

18000 = 2^4 * 3^2 * 5^3

Now

factors that are multiple of 8 = 2* 3^2 * 5^3

factors that are multiple of 8and 25 = 2 * 3^2 * 5

sum = sum[factors that are multiple of 8] - [factors that are multiple of 8and 25]

where m i going wrong and how to proceed?

Thanks.