Sequence question

[JA]

For every integer k from 1 to 10, inclusive, the kth term of a certain sequence is given by (1/2)^k * (-1)^(k+1)

If T is the sum of the first 10 terms in the sequence, then T is:
a. greater than 2
b. between 1 and 2
c. between (1/2) and 1
d. between (1/4) and (1/2)
e. less than (1/4)

[RonPurewal]

there's already a ton of stuff on the forum about this problem.
http://www.manhattangmat.com/forums/post15436.html
http://www.manhattangmat.com/forums/for ... t3868.html