In a group of athletic teams in a school, 21 are in the basketball team, 26 in the hockey team and 29 in the football team. If 14 play hockey and basketball, 12 play football and basketball, 15 play hockey and football, 8 play all the three games, then how many play football only ?
1
10
2
29
3
21
4
18
5
None of the above/More than one of the above