Answers

2015-06-10T16:19:32+05:30
T5=19................eq 1
t13-t8=20
a+12d-a-7d=20
5d=20
d=4
a+4d=19
a+16=19
a=3
therefore the AP= 3, 7, 11, 15 ,19,.............

1 5 1