400-1816-180
本題由lindy提供
In the finite sequence of positive integers K1, K2,
(1) K4 = 11
(2) K6 = 29
A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
D. EACH statement ALONE is sufficient.
E. Statements (1) and (2) TOGETHER are NOT sufficient.
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答案：
D
有限數(shù)列
也就是：K3=K2+K1 K9=K8+K7; 問K9的值？
K5=18 K4+K3=18
（1）K3=7 K6=29 K7=47 K8=76 K9=123 充分
（2）K6知道 K5知道，如上 充分
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