Question

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

Answer 1

hope it helps you out

Answer 2

253=3+(n-1)5
250/5=n-1
50=n-1
n=51
20 term from end
(51-20+1)th term from beginning
32 term
a+31d
3+31×5
158