Question

The frist term of an ap is 19 and the ratio of its 6th and 22nd term is 11:31 .find the ap?

Answer 1

Answer:

first term a1 is 19

and ration is given a6/a22=11:31

a+5d/a+21d=11:31

31a+155d=11a+231d

20a=76d

a=3.8d------1

put the value of a1 in  eq 1

19=3.8d

d=19/3.8

d=5

19,24,29,34,39,......