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The 4th term of a geometric sequence is 135, and the common ratio is 3. What is the first term of the sequence?

The 4th term of a geometric sequence is 135, and the common ratio is 3. What is the first term of the sequence?
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3 votes
The 4th term of a geometric sequence is 135, and the common ratio is 3. What is the first term of the sequence?

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User Oleg Kurbatov
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8.7k points

1 Answer

3 votes
Assume the first term is a. The second term is 3a. The third term is 9a. The forth term is 27a.

27a=135 therefore a=135/27 = 5
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User MrValdez
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