Difference between revisions of "1972 AHSME Problems/Problem 19"
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Latest revision as of 11:56, 10 June 2016
Solution
We begin by evaluating the sum of the first 
terms of the sequence with 
, 
, and 
. We find that the sum of the first term of the sequence is , the sum of the first two terms is 
, and the sum of the first three terms 
. From here, we can simply guess and check the answer choices and will find that only 
works.
