Problem
Here is our new Problem:
In an arithmetic sequence, u7+u8+u9 > 0 and u7+u10 < 0.
For what value of n, Sn is maximum ?
Here is our new Problem:
In an arithmetic sequence, u7+u8+u9 > 0 and u7+u10 < 0.
For what value of n, Sn is maximum ?
Serge Hazanov says:
Jolie Powell says:
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