Question

Find the 20th term from thelast term of the ap:3,8,13..........,253

Answer 1

Common difference=5 total no. of terms in AP 253=3+(n-1)5 250=5(n-1) 50=n-1 n=51 nth from end=An-m+1 20th from end =A51-20+1 A22=3+(22-1)5 =3+105 =108 Therefore 20th term from end is 108