
Concept explainers
a.
The relationship between the terms of the sequence and find the next five terms in the sequence.
a.

Answer to Problem 31PPS
Explanation of Solution
Given:
The Fibonacci sequence can be defined by a recursive formula. The first six terms are 1,1,2,3,5,8,….
Calculation:
The Fibonacci sequence is given by 1,1,2,3,5,8,…
Here observe that starting from the third term onward, each term is the sum of the previous two terms.
So, in Fibonacci sequence, each term is the sum of the previous two terms in the sequence.
So, in order to find the next five terms, add the preceding two terms for each. Like the next term would be
Similarly, the next term would be
In the same way the next three terms would be 34, 55 and 89.
b.
The formula for the nth term if
b.

Answer to Problem 31PPS
Explanation of Solution
Given:
The Fibonacci sequence can be defined by a recursive formula. The first six terms are 1,1,2,3,5,8,….
Calculation:
Any term in the Fibonacci sequence is given by the sum of the previous two terms.
Let
c.
The 15th term.
c.

Answer to Problem 31PPS
Explanation of Solution
Given:
The Fibonacci sequence can be defined by a recursive formula. The first six terms are 1,1,2,3,5,8,….
Calculation:
The 15th term of the sequence will be the sum of the 13th and 14th terms of the sequence.
First 14 terms of the sequence are
So, the 15th term will be the sum of 233 and 377. That is, the 15th term of the sequence is
Thus, the 15th term of the sequence is 610.
d.
To explain why the Fibonacci sequence is not an arithmetic sequence.
d.

Explanation of Solution
Given:
The Fibonacci sequence can be defined by a recursive formula. The first six terms are 1,1,2,3,5,8,….
Calculation:
The common difference between any two terms of the arithmetic sequence is always equal, while the difference between any two terms of the Fibonacci sequence is not same for any two terms.
Thus, the Fibonacci sequence is not an arithmetic sequence.
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