Question

find the 20th term from the last term of the AP: 3,8,13,....... ,253

Answer 1

hope it is helpful for you

Answer 2

Given that-
from the last term A.P. will be-
253,....,13,8,3
Therefore,
a1=253
d=8-13=-5
an=3
a20=?
an=a+(n-1)d
3=253+(n-1)(-5)
3-253=(n-1)(-5)
-250=(n-1)(-5)
-250/-5=(n-1)
50=(n-1)
n=50+1
n=51

Therefore,an=a+(n-1)d
a20=253+(20-1)(-5)
=253+19(-5)
=253-95
=158 is your answer
Hope it will help you