2. 外语
  3. The numbers 3, 10, 17, 24, 31 and 38 are the first six terms of an infinite sequence in which each term after first is 7 greater

The numbers 3, 10, 17, 24, 31 and 38 are the first six terms of an infinite sequence in which each term after first is 7 greater

admin2021-10-21  40
问题 The numbers 3, 10, 17, 24, 31 and 38 are the first six terms of an infinite sequence in which each term after first is 7 greater than the preceding term. What is the 45th term of the sequence?
选项 A、308
B、311
C、312
D、315
E、318
答案B
解析 题目中的序列是一个等差数列a1=3，公差d=7，那么a45=a1+(45-1)×7=311。
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