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题库 / GMATLA-DS-33
If r is a constant and ~$a_n=r·n$~ for all positive integers ~$n$~, for how many values of n is ~$a_n<100$~?
(1) ~$a_{50}=500$~
(2) ~$a_{100}+a_{105}=2,050$~
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
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