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Re: Sequences: sum of 1st 2 terms is 18, sum of 1st 4 is 52  TOPIC_SOLVED

therefore, 2a+d=18
and 4a+6d=52
solving, a=7,d=4;
therefore sum=(8/2)*(2*7+(8-1)*4)=168,the ans. :)
by bigj
on Tue Jun 23, 2009 10:15 am
 
Forum: Discrete Math
Topic: Sequences: sum of 1st 2 terms is 18, sum of 1st 4 is 52
Replies: 3
Views: 1970

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