29!
1. Athletics
2. Archery
3. Football
4. Shooting
5. Sailing
6. Hockey
7. Handball
8. Basketball
9. Badminton
10. Judo
11. Taekwondo
12. Fencing
13. Modern Pentathlon
14. Triathlon
15. Aquatics (Swimming)
16. Equestrian
17. Boccia
18. Wheelchair Rugby
19. Rowing
20. Boxing
21. Canoeing
22. Cycling
23. Goalball
24. Volleyball
25. Table Tennis
26. Tennis
27. Weightlifting
28. Wrestling
29. Gymnastics
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In 2010, the Royal Mint said that 87 million of the 29 special 50p coins would be in circulation by the end of 2011. Assuming they have minted equal quantities of each, there will be 3 million of each design in circulation. (The math supports this - 29 into 87 million goes exactly 3 million times).
They are worth £70 if you get all of them according to the royal mint website. try out the website.
The Swimming one where the face is hidden under the water. Only 600 were released into circulation.