Find the sum sn of the arithmetic sequence a7=14/3 d=-4/3 n=15
1 answer:
Answer:
Step-by-step explanation:
Given
Required
The sum of n terms
First, we calculate the first term using:
Let
So, we have:
Substitute and
Collect like terms
Take LCM and solve
The sum of n terms is then calculated as:
Where:
So, we have:
Take LCM
Open bracket
Hence,
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