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# △ is one operation of addition, subtraction, multiplication, or divisi

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Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 5600
GMAT 1: 800 Q59 V59
GPA: 3.82
△ is one operation of addition, subtraction, multiplication, or divisi [#permalink]

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31 Aug 2017, 01:24
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Difficulty:

15% (low)

Question Stats:

83% (00:36) correct 17% (00:34) wrong based on 52 sessions

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△ is one operation of addition, subtraction, multiplication, or division. Is 1△3=3△1？

1) 1△1=1
2) 2△3=6

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MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
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"Only $99 for 3 month Online Course" "Free Resources-30 day online access & Diagnostic Test" "Unlimited Access to over 120 free video lessons - try it yourself" Director Joined: 04 Dec 2015 Posts: 700 Location: India Concentration: Technology, Strategy Schools: ISB '19, IIMA , IIMB, XLRI WE: Information Technology (Consulting) △ is one operation of addition, subtraction, multiplication, or divisi [#permalink] ### Show Tags 31 Aug 2017, 02:06 MathRevolution wrote: △ is one operation of addition, subtraction, multiplication, or division. Is 1△3=3△1？ 1) 1△1=1 2) 2△3=6 1) $$1△1=1$$ $$1*1 = 1$$ $$\frac{1}{1} = 1$$ Therefore operation $$△$$ could be multiplication or division. $$1△3=3△1$$ $$1*3 = 3*1 = 3$$ $$\frac{1}{3}$$ is not equal to $$\frac{3}{1}$$ We are getting two values. Hence I is Not Sufficient. 2) $$2△3=6$$ $$2*3 = 6$$ Only multiplication of $$2$$ and $$3$$ gives $$6$$. Therefore operation $$△$$ is multiplication. $$1△3=3△1$$ $$1*3 = 3*1 = 3$$ Hence II is Sufficient. Answer (B)... _________________ Please Press "+1 Kudos" to appreciate. Senior Manager Joined: 02 Jul 2017 Posts: 294 GMAT 1: 730 Q50 V38 Re: △ is one operation of addition, subtraction, multiplication, or divisi [#permalink] ### Show Tags 31 Aug 2017, 03:35 △ is one operation of addition, subtraction, multiplication, or division. We have to find if 1△3=3△1. This is only true if △ is either + or multiplication ... else for - and division it will be false. 1) 1△1=1 by above equation we can conclude △ is either multiplication or division. So Not sufficient 2) 2△3=6 Above equation is only possible if △ is multiplication. For all other operations it will not sattis fy the equation. so △ = multiplication and by this : 1△3=3△1 is True So Sufficient Answer: B Math Revolution GMAT Instructor Joined: 16 Aug 2015 Posts: 5600 GMAT 1: 800 Q59 V59 GPA: 3.82 Re: △ is one operation of addition, subtraction, multiplication, or divisi [#permalink] ### Show Tags 03 Sep 2017, 18:40 => 1) 1△1=1 △ could be the multiplication or the division. If △ is the multiplication, 1△3 = 3△1. If △ is the division, 1△3 is not equal to 3△1. This is not sufficient. 1) 2△3=6 △ should be the multiplication only. Then we have 1△3 = 3△1. This is sufficient. Ans: B _________________ MathRevolution: Finish GMAT Quant Section with 10 minutes to spare The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy. "Only$99 for 3 month Online Course"
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Re: △ is one operation of addition, subtraction, multiplication, or divisi   [#permalink] 03 Sep 2017, 18:40
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# △ is one operation of addition, subtraction, multiplication, or divisi

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