anonymous
  • anonymous
Which one is a rule for the nth term of the sequence 3, 15, 75, 375...?
Mathematics
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anonymous
  • anonymous
Which one is a rule for the nth term of the sequence 3, 15, 75, 375...?
Mathematics
schrodinger
  • schrodinger
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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anonymous
  • anonymous
By dividing consecutive terms: 15 / 3 = 5 75 /15 = 5 we find that this is a geometric series with a common ratio of 5 (k = 5). We can then plug this into the general formula for a geometric series: \[x _{n}=a _{o}\times k ^{n-1}\] where x is the term you're solving for and a is the first term. With this, we get: \[x _{n}=3 \times 5^{n-1}\]

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