SOLUTION: S25, when a1 = 32 and d = -1

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Question 976757: S25, when a1 = 32 and d = -1
Answer by Cromlix(4381) About Me  (Show Source):
You can put this solution on YOUR website!
a(n) = a(1) + (n - 1) d
a(25) = 32 + (25 - 1) -1
a(25) = 8
S(n) = [n(a(1) + a(n)]/2
S(25) = [25(32 + 8)]/2
S(25) = 520
Hope this helps:-)