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In an arithmetic sequence, the sum of the second and eighth terms is 5, and the product of the fourth and fifth terms is also 5 .

What is the sum of the first 20  terms of this sequence?

 Oct 15, 2022
 #1
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The sum of the first 20 terms is 308.

 Oct 15, 2022
 #2
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wrong

Guest Oct 15, 2022

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