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Asked by Hitome Muramasa

The second and sixth terms of an arithmetic sequence is 2:5 and their sum is 28. Find the sum of the first 10th term.
9 years ago

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Answered by Steve
(a+d)/(a+5d) = 2/5
a+d + a+5d = 28

find a and d, and then

S10 = 10/2 (2a+9d)
9 years ago
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The second and sixth terms of an arithmetic sequence is 2:5 and their sum is 28. Find the sum of the first 10th term.

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