Infinite sequence

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II: Master | Next Rank: 500 Posts; Posts: 400; Joined: Mon Dec 10, 2007 1:35 pm; Location: London, UK; Thanked: 19 times; GMAT Score:680

by II » Sun Feb 17, 2008 1:52 pm

Hi All,

Any ideas on how best to approach this problem.

Thanks,
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Source: Beat The GMAT — Problem Solving | Sun Feb 17, 2008 1:52 pm

subbu123: Newbie | Next Rank: 10 Posts; Posts: 5; Joined: Mon Feb 11, 2008 6:18 pm; Location: USA

by subbu123 » Sun Feb 17, 2008 2:46 pm

Sum of first 4 terms is 6. After every 4 terms, terms repeat.

There are 20 4 terms in 83 tems
sum = 20*6 = 120 + sum of the first three (8) = 128.

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