Question

plesee ansthe above que

Answer 1

given that
5th term =19
difference 8th term from 13 is 20
term 5=a+(n-1)d
19 = a+4d
term 8 = a+7d
term 13 =a+12d
difference =20
a+7d-(a+12d)=20
a+7d-a-12d =20
-5d=20
d=-4
now;
term 5 =a+4d
19=a+4×(-4)
19=a+(-16)
19=a-16
19+16=a
a=25
AP
t1=a =25
t2=a+d=25+(-4)
=25-4
=21
t3= a+2d
=25+2×(-4)
=25+(-8)
=25-8
=17
AP=25,21,17............so on.