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DerKrebs [107]
3 years ago
7

Which of these sequences is a geometric sequence?

Mathematics
2 answers:
podryga [215]3 years ago
7 0
3, 9, 27, 81, 343, 729, … is a geometric sequence because each term is obtained by multiplying 3 to the preceding term.
gogolik [260]3 years ago
4 0

Answer with Explanation:

A Sequence is said to be geometric sequence ,if the ratio of two consecutive terms is same.For example,

Look at the sequence:

  A, AR, AR^2,AR^3,AR^4,........

Ratio of two consecutive terms is :

   \frac{A}{AR}=\frac{AR}{AR^2}=\frac{AR^2}{AR^3}=......=\frac{1}{R}

The ratio of any term to the term Preceding it is called Common ratio. Here Common ratio is =R,which will be same for the entire Sequence.

Now, looking at the option Carefully

In option D

\text{Common Ratio}=\frac{9}{3}=\frac{27}{9}=\frac{81}{27}=\frac{343}{81}=\frac{729}{343}=3

Option D : 3, 9, 27, 81, 343, 729, …..is a geometric sequence

 

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