00:02
In this problem, we can either have a class a, class day or class c internet actress.
00:06
Let us see the possibilities in each case.
00:09
Class a possibility.
00:11
First is it has to be a zero.
00:13
Remaining 7 can be either 0 or 1.
00:19
And then remaining 24.
00:20
1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 15, 16, 17, 19, 19, 20, 21, 22, 22, 23, 24.
00:30
So this is zero fixed.
00:33
Number of possibility for each place here is two, either zero or one.
00:37
So this is two power seven such possibilities.
00:40
And here we have 24 such places...