Concept explainers
a.
Graph the first 10 terms of the sequence.
a.

Answer to Problem 2PS
Explanation of Solution
Calculation:
Let us find the first 10 terms in the sequence
The sequence is 3+(−1)n
The first 10 terms of the sequence given by 3+(−1)n are
a1=3+(−1)1a1=2.......1stterma2=3+(−1)2a2=4.......2ndterma3=3+(−1)3a3=2.......3rdterma4=3+(−1)4a4=4.......4thterma5=3+(−1)5a5=2.......5thterm
a6=3+(−1)6a6=4.......6thterma7=3+(−1)7a7=2.......7thterma8=3+(−1)8a8=4.......8thterma9=3+(−1)9a9=2.......9thterma10=3+(−1)10a10=4.......10thterm
Using the values derived above, we plot theses in the graph below
b.
Describe the behaviour of the graph of the sequence.
b.

Answer to Problem 2PS
odd an=2,even an=4
Explanation of Solution
Calculation:
Hence, the graph in (a) shows that when n is odd an=2 and when n is even, an=4
c.
Complete the table.
c.

Answer to Problem 2PS
n110101100010,001an24242
Explanation of Solution
Calculation:
We put in different values of n in the given equation We have seen in (b) that when n is odd an=2 and when n is even, an=4
Using the above, we can fill the table as below
Hence, we see that 1,101,10001 are odd and 10 and 1000 are even
n110101100010,001an24242
d.
Determine (if possible) the value of an as n approaches infinity.
d.

Answer to Problem 2PS
It is not possible to find the value of an as n approaches infinity
Explanation of Solution
Calculation:
We have seen in (b) that when n is odd an=2 and when n is even, an=4
This pattern continues as n approaches infinity
Hence, it is not possible to find the value of an,as,n approaches infinity.
Chapter 9 Solutions
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