How many US presidents did not have a wife?
1
2
2
2
2
3
2
1
3
2
1
4
3
2
1
4
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
7
2
1
4
5
3
7
2
1
4
5
3
7
2
1
4
5
3
7
2
1
4
5
3
7
2
0
1
4
5
3
6
7
2
1
4
5
0
3
6
7
8
1
4
5
3
6
7
8
1
4
5
3
6
7
8
1
4
5
3
6
7
9
8
1
4
5
6
7
9
8
4
5
13
6
7
9
8
5
13
6
7
9
8
5
13
6
7
9
8
13
6
7
9
11
8
13
6
7
9
10
11
8
13
6
7
9
10
11
8
13
6
7
9
10
11
8
13
6
7
9
10
11
8
13
6
7
9
10
11
8
13
12
6
9
10
11
8
13
12
6
9
10
11
8
13
12
6
No