Question

find the 28 term from the last term of the AP 3 ,8 ,13 ......253

Answer 1

let's invert the series so that the 28th term from last becomes 28th from first

series Is

253,......13,8,3


here

a=253

d=-5
$a |28| = a + 27d \\ = 253 + 27( - 5) = 118$

Answer 2

Answer:

refers to the attachment