Problem Solving

For every integer k 1 to 10, inclusive, the kth term of a certain sequence given by (-1)^k + 1 (1/2^k). If T is the sum of the first 10 terms in the sequence, then T is

greater than 2
between 1 and 2
between 1/2 and 1
between 1/4 and 1/2
less than 1/4

The answer is D can anybody show me a good approach for this?

Again, answered many times before:

https://www.beatthegmat.com/1-k-1-1-2-k-help-t25607.html


https://www.beatthegmat.com/sequence-exp ... 31657.html