since there are 7 terms from a7 to a14, and the difference is 7, d=1
so, a1=3
Now you can easily find a27, and of course,
S27 = 27/2 (a1+a27))
The following problem refers to an arithmetic sequence. If the seventh term is 9 and the fourteenth term is 16, find the term a1, the common difference
d, and then find a27 and S27
1 answer
1 answer