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In this particular arithmetic sequence, a7 = 34 and a15 = 74. What is the value of a21?

In this particular arithmetic sequence, a7 = 34 and a15 = 74. What is the value of a21?
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In this particular arithmetic sequence, a7 = 34 and a15 = 74. What is the value of a21?

User Das
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So i believe its a21 = 109 a21 = 85 a21 = 108 a21 = 104.

So the answer would be 104

Hope this helps
User Buggabill
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