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

In an A.P , if the common different (d)=_4, and the seventh term (a7)

1.	In an A.P , if the common different (d)=_4, and the seventh term (a7) is 4 then find the first term.
Answer» d=-4 , a7=4 a+6d=4a+6(-4)=4a=28 Given 7th term of ap = 4 Common difference= -4 If n =7 an = a+(n-1)d4=a+(4-1)-44=a+3*-44=a-124+12= a16=a