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Question of the Day - 8th August, 2009

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by quant-master » Fri Aug 07, 2009 10:44 pm
If the operation * is one of the four Arithmatic operation addition,Subtraction,Multiplication and division.Is (6*2)*4=6*(2*4)

A)3*2>3
B)3*1=3

Answers will be posted in 24 hrs time.

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Source: — Data Sufficiency |
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by tohellandback » Sat Aug 08, 2009 1:36 am
IMO A
1) * can be multiplication or addition. In both cases,
SUFF

2) * can be multiplication or division.
not suff
The powers of two are bloody impolite!!
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by ram_raj » Sat Aug 08, 2009 4:22 am
IMO A

S1- * can be Multiplication or Addition - Either one the answer to the question is Yes. So Sufficient

S2-* can be Multiplication or division. - if multiplication answer to the question is Yes. If division No. So insufficient
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by quant-master » Sat Aug 08, 2009 9:46 am
ram_raj wrote:IMO A

S1- * can be Multiplication or Addition - Either one the answer to the question is Yes. So Sufficient

S2-* can be Multiplication or division. - if multiplication answer to the question is Yes. If division No. So insufficient
that's correct!

Let me know if anybody needs further clarification.

That's the OA.

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by real2008 » Sun Aug 09, 2009 7:20 am
ans is C
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by Brent@GMATPrepNow » Sun Jun 03, 2012 3:57 pm
quant-master wrote:If the operation * is one of the four Arithmatic operation addition,Subtraction,Multiplication and division.Is (6*2)*4=6*(2*4)

A)3*2>3
B)3*1=3

Answers will be posted in 24 hrs time.

Thanks,
Quant-Master
Statement 1: 3 * 2 > 3

Check each operation.

Does * stand for addition?
3 + 2 > 5. Yes, it might be addition

Does * stand for subtraction?
3 - 2 < 5. No, it can't be subtraction

Multiplication?
3 x 2 > 3. Yes, it might be multiplication

Division?
3/2 < 3. No, it can't be division

So, * stands for either addition or multiplication
If * stands for addition, does (6 + 2) + 4 = 6 + (2 + 4)? Yes
If * stands for multiplication, does (6 x 2) x 4 = 6 x (2 x 4)? Yes
Since both cases yield the same answer to the target question (Yes), statement 1 is SUFFICIENT.


Statement 2: 3 * 1 = 3

Does * stand for addition?
3 + 1 does not equal 3. No, it can't be be addition

Does * stand for subtraction?
3 - 1 does not equal 3. No, it can't be subtraction

Multiplication?
3 x 1 = 3. Yes, it might be multiplication

Division?
3/1 = 3. Yes, it might be division

So, * stands for either multiplication or division

If * stands for multiplication, does (6 x 2) x 4 = 6 x (2 x 4)? Yes
If $ stands for division, does (6/2)/4 = 6/(2/4)? No

Since the answer to the target question can be either Yes or No, statement 2 is NOT SUFFICIENT.

Answer = A

Cheers,
Brent
Brent Hanneson - Creator of GMATPrepNow.com
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