Question

FIND THE 10TH TERMS FROM 1ST AND LAST TERMS OF AP 3,8,13,........253

Answer 1

a=3
d=5
n=10

T10=a+9d
=3+9(5)
=3+45
=48

The tenth term of AP is 48

Answer 2

an = a+(n-1)d

given, 
          a=3
           d = a2 - a1
             =8-3
              =5
              n=10
and we need to find   a10.
so, a10 = 3 + (10-1)5
             =3+45
              =48
hence, our 10th term is 48.