
If the nth term of GP is then the value of n is
a) 11
b) 10
c) 9
d) 4
Answer
428.7k+ views
Hint: Here we have to the nth term of the sequence. The sequence is an infinite sequence. First we have to determine the kind of a sequence and then we have a formula for the nth term and then by substituting the values we determine the solution for the question.
Complete step by step answer:
In mathematics we have three types of series namely, arithmetic series, geometric series and harmonic series.
First we have to determine the kind of the sequence.
Suppose if the sequence is an arithmetic sequence, then we have to check the common difference. The .Let we determine the difference between first two terms and we determine the difference between the next two terms . Hence . Therefore the given sequence is not an arithmetic sequence.
Suppose if the sequence is a geometric sequence, then we have to check the common ratio. The .Let we determine the ratio between first two terms and we determine the difference between the next two terms . Hence . Therefore the given sequence is a geometric sequence.
The geometric series is defined as the series with a constant ratio between the two successive terms. The finite geometric series is generally represented as , where a is first term and r is a common ratio.
The nth term of the given sequence is given by , where represents the nth term. The is the first term and it is 5. The is the common ratio and it is .
Therefore the nth term is given by . We have the term
So we have
On cancelling the number 5 we have
On equating the powers we have
Therefore, . Hence, option (a) is the correct option.
Note:
We must know about the geometric progression arrangement and it is based on the first term and common ratio. The common ratio of the geometric progression is defined as where represents the second term and represents the first term. The sum of n terms is defined on the basis of common ratio.
Complete step by step answer:
In mathematics we have three types of series namely, arithmetic series, geometric series and harmonic series.
First we have to determine the kind of the sequence.
Suppose if the sequence is an arithmetic sequence, then we have to check the common difference. The
Suppose if the sequence is a geometric sequence, then we have to check the common ratio. The
The geometric series is defined as the series with a constant ratio between the two successive terms. The finite geometric series is generally represented as
The nth term of the given sequence is given by
Therefore the nth term is given by
So we have
On cancelling the number 5 we have
On equating the powers we have
Therefore,
Note:
We must know about the geometric progression arrangement and it is based on the first term and common ratio. The common ratio of the geometric progression is defined as
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