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1*0?

by sanju09 » Mon Sep 13, 2010 4:04 am
The operation* represents either addition, subtraction, or multiplication of integers, what is the value of 1*0?
(1) 0*2 = 2.
(2) 2*0 = 2.


[spoiler]Source: Set 24 Quant q# 9[/spoiler]
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Source: — Data Sufficiency |

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by Rahul@gurome » Mon Sep 13, 2010 4:13 am
(1) 0 * 2 = 2 implies * cannot be subtraction, multiplication and division. So, * represents addition as 0 + 2 = 2.
Hence, 1 * 0 = 1 + 0 = 1
So, (1) is SUFFICIENT.

(2) 2 * 0 = 2 implies * can represent either addition or subtraction as 2 + 0 = 2 and 2 - 0 = 2
So, 1 * 0 = 1, whether * represents addition or subtraction.
So, (2) is SUFFICIENT.

The correct answer is [spoiler](D)[/spoiler]. But here the two statements are contradicting each other. Seems as if something is missing from the question.
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by sanju09 » Mon Sep 13, 2010 4:59 am
Rahul@gurome wrote:(1) 0 * 2 = 2 implies * cannot be subtraction, multiplication and division. So, * represents addition as 0 + 2 = 2.
Hence, 1 * 0 = 1 + 0 = 1
So, (1) is SUFFICIENT.

(2) 2 * 0 = 2 implies * can represent either addition or subtraction as 2 + 0 = 2 and 2 - 0 = 2
So, 1 * 0 = 1, whether * represents addition or subtraction.
So, (2) is SUFFICIENT.

The correct answer is [spoiler](D)[/spoiler]. But here the two statements are contradicting each other. Seems as if something is missing from the question.
How are the two statements contradicting each other? Why [spoiler]A is OA[/spoiler]?
The mind is everything. What you think you become. -Lord Buddha



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by Rahul@gurome » Mon Sep 13, 2010 5:18 am
sanju09 wrote: How are the two statements contradicting each other? Why [spoiler]A is OA[/spoiler]?
Because 1st statement suggests that * represents addition and (2) suggests that * represents addition and subtraction, both. Looking at the main question, I still feel that OA should be (D), as we are able to find the value of 1*0.
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by sanju09 » Mon Sep 13, 2010 5:26 am
Rahul@gurome wrote:
sanju09 wrote: How are the two statements contradicting each other? Why [spoiler]A is OA[/spoiler]?
Because 1st statement suggests that * represents addition and (2) suggests that * represents addition and subtraction, both. Looking at the main question, I still feel that OA should be (D), as we are able to find the value of 1*0.
(2) suggests that * represents addition OR subtraction, not contradicting (1) really.

I too doubt the source on OA issue.
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by Rahul@gurome » Mon Sep 13, 2010 5:30 am
sanju09 wrote: (2) suggests that * represents addition OR subtraction, not contradicting (1) really.

I too doubt the source on OA issue.
Had the question asked about "what does * represent?, then the OA would have been (A) but here the question asks the value of 1*0, which we can find using both the statements independently. So, it seems to be (D).
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by sanju09 » Mon Sep 13, 2010 5:34 am
Rahul@gurome wrote:
sanju09 wrote: (2) suggests that * represents addition OR subtraction, not contradicting (1) really.

I too doubt the source on OA issue.
Had the question asked about "what does * represent?, then the OA would have been (A) but here the question asks the value of 1*0, which we can find using both the statements independently. So, it seems to be (D)...
...and hence the two statements are NOT contradicting each other, right?
The mind is everything. What you think you become. -Lord Buddha



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by Rahul@gurome » Mon Sep 13, 2010 5:36 am
sanju09 wrote: ...and hence the two statements are NOT contradicting each other, right?
Yes you can say that they are not contradicting.
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by sanju09 » Mon Sep 13, 2010 5:38 am
Rahul@gurome wrote:
sanju09 wrote: ...and hence the two statements are NOT contradicting each other, right?
Yes you can say that they are not contradicting.
then thank you
The mind is everything. What you think you become. -Lord Buddha



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