Which is correct effort or efforts?

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7. What is the formula of effort?
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Tags

1. #total
2. #ultimately
3. #means
4. #imply
5. #really
6. #effort
7. #sentence
8. #which
9. #successful
10. #attempts
11. #keeps
12. #indicates
13. #indeed
14. #efforts
15. #unsuccessful
16. #person
17. #trying
18. #there
19. #repeatedly
20. #would
21. #involved