How many books are there in the Harry Potter series?
7
5
5
5
5
3
4
5
3
4
5
3
4
5
3
4
7
5
3
4
7
5
3
4
7
5
3
4
7
5
6
3
4
7
5
6
3
4
7
5
6
3
4
7
5
6
3
4
2
7
5
6
3
4
2
7
5
6
3
4
2
7
5
6
3
4
2
7
5
6
3
8
4
2
7
5
6
3
8
4
2
7
5
6
3
8
4
2
7
6
3
8
1
4
2
7
6
3
9
8
1
4
2
7
6
3
9
8
1
4
2
7
6
11
9
8
1
2
7
6
11
9
10
8
1
2
7
6
11
9
10
8
0
1
2
7
6
11
9
10
8
1
2
6
11
9
12
10
8
1
2
6
11
13
9
12
10
8
1
2
16
6
11
13
9
12
10
8
1
2
16
11
13
9
12
10
8
1
2
16
11
13
9
12
10
8
1
2
16
11
13
9
114
66
108
116
132
168
192
121
118