GMAT 考满分题库

It is given that: $$T_n$$ = 1 + 2 +3+. . . + n, so is $$T_n$$ an odd number?
1: $$T_{n+1}$$ is odd
2: $$T_{2n}$$ is even
  • AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
  • BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  • CBoth statements TOGETHER are sufficient, but NEITHER one ALONE is sufficient.
  • DEACH statement ALONE is sufficient.
  • EStatements (1) and (2) TOGETHER are NOT sufficient.
显示答案
正确答案: C

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