Thread: Arithmetic Sequence Question

Hi this is a Question about AP I've been having trouble about, help would be appreciated.

Q)- The 4th, 6th, and 8th terms of an AP add up to -6. Find the sixth term.

Help would be tremendously appreciated!

Originally Posted by SeaNanners

Hi this is a Question about AP I've been having trouble about, help would be appreciated.

Q)- The 4th, 6th, and 8th terms of an AP add up to -6. Find the sixth term.

Help would be tremendously appreciated!

.

Therefore

A slightly different way- since we are asked specifically for the sixth term, call that "a". Then, with "r" as the common difference, the fourth term is a- 2r and the 8th term is a+ 2r. Add those together and you will see that the "2r" terms cancel!