SOLUTION: Find a1 if Sn=468, an=375, and r=5.

Algebra ->  Sequences-and-series -> SOLUTION: Find a1 if Sn=468, an=375, and r=5.      Log On


   

Question 1032812: Find a1 if Sn=468, an=375, and r=5.
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Well, you could list the numbers in the series in reverse order, dividing by five each time...as in
375 + 75 + 15 + 3 = 468
so that a%5B1%5D+=+3
(That's the easy way)
The harder way is to use the formula for Sn...