00:01
So you have sets a, b, and c such that the union of a and b is equal to the union of b and c.
00:09
And so you want to know, is it true that a has to equal b? and the answer is no.
00:17
You could take, for instance, if you had, let's say this was set b, and it was the numbers one, two, three, four, five, six, and that's set b.
00:27
And let's say set a is these two numbers.
00:34
And now let's say this is set b again, one, two, three, four, five, six, and that's set b...