Question

The 5th term of an AP is 20 and the common difference is -2, find the first 4 terms

Answer 1

a+4d=20
a=20-4d

a=20-(-8)=28

a=28, d=-2

First four terms

a,a+d,a+2d,a+3d.......

Answer 2

i need a answer for :

The sum of 2nd and 5th terms of an ap is 23 . the difference of 3rd term and 10th term is 21 . find to terms of the ap