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The symbol Δ represents which one of the following operations: additio

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The symbol Δ represents which one of the following operations: additio  [#permalink]

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New post 02 Aug 2018, 23:49
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D
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Question Stats:

72% (01:29) correct 28% (01:52) wrong based on 429 sessions

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The symbol Δ represents which one of the following operations: addition, subtraction, or multiplication?


(1) aΔ(bΔc) ≠ aΔ(cΔb) for some numbers a, b, and c.
(2) aΔ(bΔc) ≠ (aΔb)Δc for some numbers a, b, and c.


NEW question from GMAT® Quantitative Review 2019


(DS08352)

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Re: The symbol Δ represents which one of the following operations: additio  [#permalink]

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New post 03 Aug 2018, 02:35
Bunuel wrote:
The symbol Δ represents which one of the following operations: addition, subtraction, or multiplication?


(1) aΔ(bΔc) ≠ aΔ(cΔb) for some numbers a, b, and c.
(2) aΔ(bΔc) ≠ (aΔb)Δc for some numbers a, b, and c.


NEW question from GMAT® Quantitative Review 2019


(DS08352)


Question stem:-Type operation is to be unique.

St1:- aΔ(bΔc) ≠ aΔ(cΔb) for some numbers a, b, and c.
Only subtraction satisfy this condition.
Hence, sufficient.

St2:-Δ(bΔc) ≠ (aΔb)Δc for some numbers a, b, and c.
Only subtraction satisfy this condition.
Hence, sufficient.

Ans. (D)
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Re: The symbol Δ represents which one of the following operations: additio  [#permalink]

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New post 03 Aug 2018, 03:34
(1) aΔ(bΔc) ≠ aΔ(cΔb) for some numbers a, b, and c.
Addition, and multiplication would always be equal from same numbers, so it has to be subtraction
Sufficient

(2) aΔ(bΔc) ≠ (aΔb)Δc for some numbers a, b, and c.
Addition, and multiplication would always be equal from same numbers, so it has to be subtraction
Sufficient

Hence, D.
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Re: The symbol Δ represents which one of the following operations: additio  [#permalink]

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New post 18 Oct 2018, 08:47
Bunuel wrote:
The symbol Δ represents which one of the following operations: addition, subtraction, or multiplication?


(1) aΔ(bΔc) ≠ aΔ(cΔb) for some numbers a, b, and c.
(2) aΔ(bΔc) ≠ (aΔb)Δc for some numbers a, b, and c.


NEW question from GMAT® Quantitative Review 2019


(DS08352)


Let a = 3, b = 2, c = 1

3 - (2-1) = 3 - 1 = 2

3 - (1 - 2) = 3 - (-1) = 4 only subtraction satisfies this.

Same concept can be applied to statement 2)

Answer choice D
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Re: The symbol Δ represents which one of the following operations: additio   [#permalink] 18 Oct 2018, 08:47
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The symbol Δ represents which one of the following operations: additio

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