I'm stuck on this problem...
How many integers between 1 and 1000 (inclusive) are neither multiples of 2 nor multiples of 5?
There are 400 integers between 1 and 1000 that are neither multiples of 2 nor multiples of 5. Basically ALL the ODD numbers except the ones that end in 5: [1, 3, 7, 9, 11......999.]