In an AP , if the common different (_4) , and the seventh term (a7) is 4 , then find the first term.

In an AP , if the common different (_4) , and the seventh term (a7) is

1.	In an AP , if the common different (_4) , and the seventh term (a7) is 4 , then find the first term.
Answer» In this question a7 can be written as a+6d where a is first term and d is common different So a+6d=4a+6(-4)=4a-24=4a=4+24a=28. So first term is 28