This appeared on my practice test 1. Is there a short cut to do this without actually writing out the terms and adding them?
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 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
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 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
