Question

51000,44500,38250,32125,....,10000
in this series Tn=10000
a=51000
can somebody plz let me know how to find common difference (d) or Sn?
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Answer 1

Answer:

This sequence/series is not in the A.P.

But, the formula of common difference (d) is 2nd term - 1 st term.

And, the formula of sum of all the terms (Sn) is n/2[2a+(n-1)d]