Question

If A = {x | x is an odd integer}. B = {x | x is an even integer}, C = {2, 3, 4, 5}, and D = {14, 15, 16, 17}, what are the elements of the set A `nn` D?

Answer 1

`A nn D = { 15, 17}`

Explanation:

`A nn D` holds all the elements that are both in `A` and in `D`.

Formally:

`A nn D = { x | x in A ^^ x in D}`

So, basically, you need all odd integers that are also `in D` which are `15` and `17`.

Thus,

`A nn D = { 15, 17}`