GMAT 考满分题库

Set A is composed of nine numbers, labeled A1 through A9. Set B is also composed of nine numbers, labeled B1 through B9. Set B is defined as follows: B1 = 1 + A1; B2 = 2 + A2; and so on, including B9 = 9 + A9. How much larger is the sum of set B's elements than the sum of set A's elements?
  • A9
  • B18
  • C27
  • D45
  • E90
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正确答案: D

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