Answers

2016-07-06T22:21:19+08:00
294 is the sum of the first 12 terms
0
How did you get it? Can you please show your solution?
Find first for the a1 and a12 by using the general term.
Then find n by using the formula: an= a1+(n-1)d
Then find the sum by using Sn= n/2[2a1+ (n-1)d]