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In an arithmetic series t1 = 25, t3= 23.
Find the value of n for which Sn = 135
4 years ago

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Answered by oobleck
n/2 (2*25 + (n-1)(23-25)/2) = 135
4 years ago
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In an arithmetic series t1 = 25, t3= 23.
Find the value of n for which Sn = 135

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