【GMAT考满分数学PS题库】A certain computer program generates a sequence of_真题_答案_解析 GMAT考满分官网

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题目内容

A certain computer program generates a sequence of numbers

${a}_{1}$ ,

${a}_{2}$ , ... ,

${a}_{n}$ such that

${a}_{1}={a}_{2}={1}$ and

${a}_{k}={a}_{k-1}+{2a}_{k-2}$ for all integers k such that

$3 \le k\le n$ . If

$n > 6$ , then

${a}_{7}=$ ?

A32
B43
C64
D100
E128

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正确答案: B

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