How many successful assassination attempts of US presidents have there been?
4
1
2
1
2
1
2
3
1
2
3
4
1
2
3
4
1
2
3
4
1
5
2
3
4
0
1
5
2
3
4
1
5
0
2
3
4
1
5
2
3
0
4
1
5
2
3
4
0
1
5
2
3
4
1
5
0
2
3
4
1
5
2
3
0
4
1
5
6
2
3
4
0
1
5
6
2
3
7
4
1
5
0
6
2
3
7
4
1
5
6
2
3
0
7
4
1
5
6
2
3
7
4
0
1
5
6
2
3
7
4
5
0
6
3
7
8
4
9
5
6
3
0
7
8
4
9
5
6
7
8
4
9
5
6
7
11
8
9
5
6
7
11
8
9
5
6
7
11
8
10
9
6
7
11
8
10
9
6
7
11
8
10
9
6
7
11
8
10
9
13
6
7
11
8
10
9
13
6
7
12
11
8
10
9
13
6
7
12
11
8
10
9
14
13
6
7
66
66
62
66