8. Which of the following are subsequences of the sequence {an} defined by
|
A. None |
B. I only |
C. II only |
|
D. III only |
E. The correct answer is not given by A, B, C, or D. |
Solution: The answer is C
The first few terms of the given sequence are:
All the elements of a subsequence of {an} must be contained in {an
}. Thus, to recognize which of the three other sequences are subsequences of {an}, write out a few terms.
Clearly, the only sequence above that is a subsequence of {an} is {cn}.