WEBVTT
00:00:00.800 --> 00:00:04.830
Find the set of element 51 minus the set of element 15.
00:00:05.350 --> 00:00:12.000
So we want to take any elements that are in this set and that are also in this set and subtract it from the first set.
00:00:12.580 --> 00:00:15.280
But, the only element in the first set is 51.
00:00:15.690 --> 00:00:18.110
And the only element in the second set is 15.
00:00:18.770 --> 00:00:25.360
So since there’s only the element 15 in the second set, there’s nothing to subtract from the first set because there is no 15 in the first set.
00:00:25.990 --> 00:00:28.490
So our answer will be the set of element 51.
00:00:29.120 --> 00:00:33.110
A similar example would be having a set of elements two, four, and five.
00:00:33.110 --> 00:00:35.760
And then subtracting the set of elements three, four, five.
00:00:36.080 --> 00:00:41.280
So since we are subtracting an element four and there is an element four in the first set, we take it away.
00:00:41.660 --> 00:00:42.970
And same thing with five.
00:00:43.510 --> 00:00:44.320
We take it away.
00:00:44.660 --> 00:00:47.220
So what’s left in the first set would be two.
00:00:47.780 --> 00:00:58.740
So in our example of the 51 minus 15, since there wasn’t anything in common to subtract, our answer was just that first set, the set of element 51.