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(-1)^(k+1) * (1/2^k) (HELP!!!!!)

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(-1)^(k+1) * (1/2^k) (HELP!!!!!)

by RideGMAT » Tue Dec 16, 2008 12:50 pm
Plz help me solve this problem from GMAT Prep:

For every integer 'k' from 1 to 10, inclusive, the kth term of a certain sequence is given by (-1)^(k+1) * (1/2^k). If 'T' is the sum of first 10 terms in the sequence, then 'T' is:-

(a) Greater than 2
(b) Between 1 & 2
(c) Between 1/4 & 1
(d) Between 1/4 & 1/2
(e) Less than 1/4


OA is (d)
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Re: (-1)^(k+1) * (1/2^k) (HELP!!!!!)

by iamcste » Tue Dec 16, 2008 1:38 pm
RideGMAT wrote:Plz help me solve this problem from GMAT Prep:

For every integer 'k' from 1 to 10, inclusive, the kth term of a certain sequence is given by (-1)^(k+1) * (1/2^k). If 'T' is the sum of first 10 terms in the sequence, then 'T' is:-

(a) Greater than 2
(b) Between 1 & 2
(c) Between 1/4 & 1
(d) Between 1/4 & 1/2
(e) Less than 1/4


OA is (d)
Pls refer here.

https://www.beatthegmat.com/gmat-prep-qu ... 21502.html

Additonal qtns not covered there, Kindly shoot
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