But what if you did this:

Z = (1 - 1) + [1 - 1] + (1 - 1) + [1 - 1] + ...

The terms in round brackets sum to Z, as do the terms in square brackets. Thus, Z = Z + Z. In fact, Z = 3Z, 4Z and so on.

## But what if you did this:

But what if you did this:

Z = (1 - 1) + [1 - 1] + (1 - 1) + [1 - 1] + ...

The terms in round brackets sum to Z, as do the terms in square brackets. Thus, Z = Z + Z. In fact, Z = 3Z, 4Z and so on.