Question

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

Answer 1

Answer:

158

Step-by-step explanation:

On reversing the AP is

253,248,243,.........,13,8,3

a=253,d=-5,n=20

a20=253+19*(-5)

=253-95

=158

Answer 2

Answer:a=3 d=8-3=5

an=a+(n-1) d

258=3+(n-1) 5

258-3=(n-1) 5

255=(n-1) 5

n-1=255/5

n-1=51

n=52

Step-by-step explanation: