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16 Aug 2019, 02:20
Kudos
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
39% (02:15) correct
61%
(02:14)
wrong
based on 92
sessions
History
Date
Time
Result
Not Attempted Yet
If ? represents one of the operations -, /, and *, is a?(b?c) = c?(a?b) for all numbers a, b, and c?
(1) a?(b + c) is not equal to a?b + a?c for some values of a, b, and c.
(2) ? represents division or subtraction.
(1) a?(b + c) is not equal to a?b + a?c for some values of a, b, and c.
(2) ? represents division or subtraction.
16 Aug 2019, 02:21
Kudos
Bookmarks
16 Aug 2019, 06:57
Kudos
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Bunuel
Given: ? represents one of the operations -, /, and *,
Asked: Is a?(b?c) = c?(a?b) for all numbers a, b, and c?
(1) a?(b + c) is not equal to a?b + a?c for some values of a, b, and c.
? is NOT *
? is either / or -
\(a-(b-c) \neq c-(a-b)\)
\(a/(b/c) \neq c/(a/b)\)
SUFFICIENT
(2) ? represents division or subtraction.
? is either / or -
\(a-(b-c) \neq c-(a-b)\)
\(a/(b/c) \neq c/(a/b)\)
SUFFICIENT
IMO D
