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06 Oct 2013, 11:12
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If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?
(1) x=5
(2) (−1)§(−2)≠(−2)§(−1)
Hello guys, I can't understand how the answer to this question could be the one indicated.
It would be great if someone would explain me how does it work.
(1) x=5
(2) (−1)§(−2)≠(−2)§(−1)
Hello guys, I can't understand how the answer to this question could be the one indicated.
It would be great if someone would explain me how does it work.
06 Oct 2013, 11:19
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If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?
(1) x=5. We need to know what § represents.
(2) (−1)§(−2)≠(−2)§(−1). § is neither addition nor multiplication. Thus it's subtraction: (x§2)§x = (x-2)-x=-2. Sufficient.
Answer: B.
(1) x=5. We need to know what § represents.
(2) (−1)§(−2)≠(−2)§(−1). § is neither addition nor multiplication. Thus it's subtraction: (x§2)§x = (x-2)-x=-2. Sufficient.
Answer: B.
General Discussion
06 Oct 2013, 11:20
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Bunuel
If the symbol § represents one of the following operations: addition, subtraction or multiplication, and x≠0, then what is the value of (x§2)§x?
(1) x=5. We need to know what § represents.
(2) (−1)§(−2)≠(−2)§(−1). § is neither addition nor multiplication. Thus it's subtraction: (x§2)§x = (x-2)-x=-2. Sufficient.
Answer: B.
(1) x=5. We need to know what § represents.
(2) (−1)§(−2)≠(−2)§(−1). § is neither addition nor multiplication. Thus it's subtraction: (x§2)§x = (x-2)-x=-2. Sufficient.
Answer: B.
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