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单选题
al, a2, a3, a4, as, …., anIn the sequence of positive integers above, al = a2 = 1, a3 = 2, a4 = 3, and as = 5. If each term after the second is obtained by adding the two terms that come before it and if an = 55, what is the value of n?
A
12
B
10
C
9
D
8
E
5
参考答案
参考解析
解析:
Following the given rule for obtaining terms, write the terms of the sequence up to and including 55: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 Since 10 numbers are listed, n = 10.
Following the given rule for obtaining terms, write the terms of the sequence up to and including 55: 1, 1, 2, 3, 5, 8, 13, 21, 34, 55 Since 10 numbers are listed, n = 10.
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