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In the sequence of positive number x1, x2, x3,. . . what is

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pushkalk
 Post subject: Re: In the sequence of positive number x1, x2, x3,. . . what is
 Post Posted: Wed Jun 08, 2011 5:17 am 
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Students


Posts: 25
My approach (I am using x1 instead of x sub1)

From statement 1 we have x2=x1/2. This means each term is 1/2 the previous term for all terms after 1(i>1).

Therefore:
x3=x1/4
x4=x1/8...................(eq-1)
x5=x1/16.................(eq-2)

thus the first 5 terms of the sequence are :
x1+(x1/2)+(x1/4)+(x1/8)+(x1/16)

Not putting values of x4 and x5 obtained above, in the statement 2 gives us a linear equation in 1 varianble.

hence C.
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tim
 Post subject: Re: In the sequence of positive number x1, x2, x3,. . . what is
 Post Posted: Thu Jul 21, 2011 6:49 pm 
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ManhattanGMAT Staff


Posts: 2242
Location: Southwest Airlines, seat 21C
looks good to me..

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Tim Sanders
Manhattan GMAT Instructor
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