
Compute the value of each of the following.
a. F15
b. F15−2
c. F15−2
d. F1515
e. F15/5

(a)
To calculate:
The value of F15.
Answer to Problem 1E
Solution:
The value of F15 is 610.
Explanation of Solution
The Fibonacci sequence is 1, 1, 2, 3, 5, 8, 13 and so on, (each term is the sum of the first two preceding terms).
The terms of the Fibonacci sequence are known as Fibonacci numbers. The Nth term of the Fibonacci sequence is denoted by FN.
Given:
The given expression is F15.
Formula used:
The recursive formula to calculate the Nth Fibonacci number is given by,
FN=FN−1+FN−2
Here FN−1 and FN−2 are the two preceding terms.
Calculation:
The 15th term in the sequence is the sum of 13th and 14th term. By using recursive formula,
FN=FN−1+FN−2
Substitute 1 for F1 and F2 in the above recursive formula to calculate F3,
F3=1+1=2
Substitute 1 for F2 and 2 for F3 to calculate F4,
F4=1+2=3
Substitute 2 for F3 and 3 for F4 to calculate F5,
F5=2+3=5
Similarly, F6=8, F7=13, F8=21, F9=34, F10=55, F11=89, F12=144, F13=233, and F14=377 are obtained.
Substitute F13 and F14 in the above recursive formula to calculate F15.
F15=233+377=610
Conclusion:
Thus, the 15th term in the sequence is 610.

(b)
To calculate:
The value of F15−2.
Answer to Problem 1E
Solution:
The value of F15−2 is 608.
Explanation of Solution
The Fibonacci sequence is 1, 1, 2, 3, 5, 8, 13 and so on, (each term is the sum of the first two preceding terms).
The terms of the Fibonacci sequence are known as Fibonacci numbers. The Nth term of the Fibonacci sequence is denoted by FN.
Given:
The given expression is F15−2.
Formula used:
The recursive formula to calculate the Nth Fibonacci number is given by,
FN=FN−1+FN−2
Here FN−1 and FN−2 are the two preceding terms.
Substitute 610 for F15 from part (a) to calculate F15−2,
F15−2=610−2=608
Conclusion:
Thus, the value of F15−2 is 608.

(c)
To calculate:
The value of F15−2.
Answer to Problem 1E
Solution:
The value of F15−2 is 233.
Explanation of Solution
The Fibonacci sequence is 1, 1, 2, 3, 5, 8, 13 and so on, (each term is the sum of the first two preceding terms).
The terms of the Fibonacci sequence are known as Fibonacci numbers. The Nth term of the Fibonacci sequence is denoted by FN.
Given:
The given expression is F15−2.
Formula used:
The recursive formula to calculate the Nth Fibonacci number is given by,
FN=FN−1+FN−2
Here FN−1 and FN−2 are the two preceding terms.
In the Fibonacci sequence F15−2 is the 13th term of the sequence.
Substitute 89 for F11 and 144 for F12 from part (a) to calculate F13,
F13=89+144=233.
Conclusion:
Thus, the value of F15−2 is 233.

(d)
To calculate:
The value of F1515.
Answer to Problem 1E
Solution:
The value of F1515 is 122.
Explanation of Solution
The Fibonacci sequence is 1, 1, 2, 3, 5, 8, 13 and so on, (each term is the sum of the first two preceding terms).
The terms of the Fibonacci sequence are known as Fibonacci numbers. The Nth term of the Fibonacci sequence is denoted by FN.
Given:
The given expression is F1515.
Formula used:
The recursive formula to calculate the Nth Fibonacci number is given by,
FN=FN−1+FN−2
Here FN−1 and FN−2 are the two preceding terms.
Substitute 610 for F15 from part (a) to get F1515,
F1515=61015=40.67
Conclusion:
Thus, the value of F1515 is 40.67.

(e)
To calculate:
The value of F15/5.
Answer to Problem 1E
Solution:
The value of F15/5 is 2.
Explanation of Solution
The Fibonacci sequence is 1, 1, 2, 3, 5, 8, 13 and so on, (each term is the sum of the first two preceding terms).
The terms of the Fibonacci sequence are known as Fibonacci numbers. The Nth term of the Fibonacci sequence is denoted by FN.
Given:
The given expression is F15/5.
Formula used:
The recursive formula to calculate the Nth Fibonacci number is given by,
FN=FN−1+FN−2
Here FN−1 and FN−2 are the two preceding terms.
The number F15/5 is the third term of the sequence given by,
F15/5=F3=F2+F1=1+1=2
Conclusion:
Thus, the value of F15/5 is 2.
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Chapter 13 Solutions
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