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

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

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Question 1032812: Find a1 if Sn=468, an=375, and r=5.
Answer by fractalier(6550) (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
(That's the easy way)
The harder way is to use the formula for Sn...
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