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Integers

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by umaa » Sat Jan 31, 2009 7:13 am
Set T is an infinite sequence of positive integers. A "superset" is a sequence in which there is a finite number of multiples of three. Is T a superset?

(1) The first six integers in T are multiples of three.
(2) An infinite number of integers in T are multiples of four.
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Source: — Data Sufficiency |

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Re: Integers

by Ian Stewart » Sat Jan 31, 2009 11:32 am
umaa wrote:Set T is an infinite sequence of positive integers. A "superset" is a sequence in which there is a finite number of multiples of three. Is T a superset?

(1) The first six integers in T are multiples of three.
(2) An infinite number of integers in T are multiples of four.
That will be E. Even using both statements, your sequence could be:

12,12,12,12,12,12,12,12....

which contains an infinite number of multiples of 3, or it could be:

3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4....

which contains only six multiples of 3.
For online GMAT math tutoring, or to buy my higher-level Quant books and problem sets, contact me at ianstewartgmat at gmail.com

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by peddisetty » Tue Feb 03, 2009 6:27 pm
What is OA ? I got E.
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