How many US vice presidents have gone on to become president?
9
1
2
1
2
1
2
1
2
1
2
1
3
2
1
3
2
1
4
3
2
1
4
3
2
1
4
3
2
1
4
3
2
5
1
4
3
2
5
1
4
3
2
5
1
4
3
0
2
5
1
4
3
2
0
5
1
4
3
2
5
1
0
4
3
2
5
1
4
3
0
2
5
1
4
3
2
0
5
1
4
3
2
5
0
4
3
6
5
4
3
6
0
5
4
3
6
7
0
5
4
3
6
7
5
0
4
3
6
7
5
4
6
7
5
8
4
6
7
9
5
8
6
7
9
5
8
6
7
9
5
8
6
7
9
5
8
6
7
9
8
6
7
11
9
8
6
7
11
9
8
6
7
11
9
8
6
7
11
9
8
6
10
7
11
9
8
6
13
10
7
11
9
8
6
13
10
7
11
9
8
6
13
10
7
11
9
8
12
6
13
10
7
11
9
8
112
ONE
66
112