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题库 / OG2020-DS-311
If ~$r$~ and ~$s$~ are positive numbers and \theta is one of the operations, ＋,－, ×, or ÷, which operation is \theta?
1. If ~$r = s$~, then ~$r \theta s$~ = 0.
2. If ~$r ≠ s$~, then ~$r \theta s ≠ s \theta r$~.
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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