How many Apollo missions successful took crews to the Moon and back?
6
3
3
3
3
3
2
3
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
2
4
3
6
5
1
2
4
3
6
5
1
2
4
3
6
5
1
2
4
3
7
6
5
1
0
2
4
3
7
6
5
1
2
4
0
3
7
6
5
1
2
4
3
7
6
5
0
1
2
4
3
7
6
5
1
0
2
4
3
7
6
5
1
2
4
0
7
6
5
1
2
4
7
6
5
0
1
2
4
9
8
7
6
5
1
0
2
4
9
8
7
6
5
1
2
4
9
0
8
7
6
5
1
11
4
9
8
7
6
5
0
11
9
8
7
6
0
11
9
8
7
6
11
9
8
7
6
12
11
9
8
7
6
12
11
9
8
7
6
10
12
13
11
9
8
7
10
12
13
11
9
8
7
10
12
13
11
16
9
8
7
10
66
62
66
132