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tenth / hundredth place

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by earth@work » Sat Feb 14, 2009 10:18 am
If n is a positive integer that is less than 10, what is the value of n?
(1) n is the tenth digit in the decimal representation of 1/n.
(2) n is the hundredth digit in the decimal representation of 1/n.
Ans: [spoiler]B, but i think it shud be A, since (1) 1/3=0.33 -suff (2)1/3=0.33 & 1/6=0.16 - insuff [/spoiler]
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Source: — Data Sufficiency |
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by scoobydooby » Sat Feb 14, 2009 10:36 am
agree with A

stmnt 1: only possible value satisfying the conditions is n=3 (1/3=0.33)
stmnt 2: both n=3, n=6 are possibe. doesnt give a unique value.

whats the source earth?
Last edited by scoobydooby on Sat Feb 14, 2009 11:54 am, edited 1 time in total.
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by cjb » Sat Feb 14, 2009 11:20 am
Surely this should be E?

Consider n=3:

1/n = 0.33333333333333333333...

or n=6:

1/n = 0.1666666666666666666...

As far as I can see, both n=3 and n=6 satisfy both (1) and (2). Have I missed something?
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by scoobydooby » Sat Feb 14, 2009 11:53 am
cjb wrote:Surely this should be E?

Consider n=3:

1/n = 0.33333333333333333333...

or n=6:

1/n = 0.1666666666666666666...

As far as I can see, both n=3 and n=6 satisfy both (1) and (2). Have I missed something?
statement 1 says n in tenth place and statement 2 says n in hundredth place
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by cjb » Sat Feb 14, 2009 11:55 am
scoobydooby wrote:statement 1 says n in tenth place and statement 2 says n in hundredth place
Statement 1 says "is the tenth digit", not "is the tenths digit". Is someone misreading this?
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by scoobydooby » Sat Feb 14, 2009 11:56 am
cjb wrote:
scoobydooby wrote:statement 1 says n in tenth place and statement 2 says n in hundredth place
Statement 1 says "is the tenth digit", not "is the tenths digit". Similarly for statement 2.

oops, got mistaken. thanks cjb
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by earth@work » Sat Feb 14, 2009 11:59 am
cjb wrote:Surely this should be E?

Consider n=3:

1/n = 0.33333333333333333333...

or n=6:

1/n = 0.1666666666666666666...

As far as I can see, both n=3 and n=6 satisfy both (1) and (2). Have I missed something?
n=6 does not satisfy (1) because it does not have 6 in tenth place instead it has 1. only n=3 satisfies (1)
stmnt 1: only possible value satisfying the conditions is n=3 (1/3=0.33)
stmnt 2: both n=3, n=6 are possibe. doesnt give a unique value.

whats the source earth?
i found these few questions on net when i was searching for GMAT quantitative questions some time back...i couldn't find answers to many, infact not very reliable answers but i liked the questions!
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by cjb » Sat Feb 14, 2009 12:02 pm
earth@work wrote:
cjb wrote:Surely this should be E?

Consider n=3:

1/n = 0.33333333333333333333...

or n=6:

1/n = 0.1666666666666666666...

As far as I can see, both n=3 and n=6 satisfy both (1) and (2). Have I missed something?
n=6 does not satisfy (1) because it does not have 6 in tenth place instead it has 1. only n=3 satisfies (1)
n=6 has 1 in the tenths place. It has six in tenth place.
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by earth@work » Sat Feb 14, 2009 12:02 pm
scoobydooby wrote:
cjb wrote:
scoobydooby wrote:statement 1 says n in tenth place and statement 2 says n in hundredth place
Statement 1 says "is the tenth digit", not "is the tenths digit". Similarly for statement 2.

oops, got mistaken. thanks cjb
wow! was misreading this all the time...thanks cbj!
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