How many major rivers are there in Africa?
7
2
3
2
3
2
3
2
3
2
3
2
4
3
2
4
3
2
4
3
5
2
4
3
5
1
2
4
3
5
1
2
4
3
5
1
6
2
4
3
5
1
6
2
4
3
5
1
6
2
4
3
5
1
6
2
4
3
5
1
6
2
4
3
5
1
0
6
7
2
4
3
8
5
1
0
6
7
2
4
3
8
5
1
6
7
2
4
9
3
8
0
5
1
6
7
2
4
9
3
8
5
1
0
6
7
4
9
8
5
1
0
6
7
4
9
8
5
1
6
7
4
9
8
0
5
1
6
7
4
9
8
5
1
62
0
6
7
4
9
10
8
5
1
12
62
0
6
7
9
10
8
5
61
1
12
6
7
9
62
10
8
0
5
1
12
ten
61
13
6
7
117
9
10
8
1
108
12
62
0
13
107
ten
6
7
61
9
10
8
117
66
12
13
108
62
0
6
69
7