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  1. tn=a+(n-1)d
  2.  
  3. Sn=n/2[2a+(n-1)d]
  4.  
  5. Example:
  6.  
  7. 100=51+(n-1)1
  8. 100=51+n-1
  9. 100=50+n
  10. n=100–50
  11. n=50
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