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