If 18th and 11th term of an A.P. are in the ratio 3 : 2, then its 21st and 5th terms are in the ratio
As 18th term : 11th term ratio is 3:2
18th term is a + 17d and 11th term is a + 10d
3a + 30d = 2a + 34d
a=4d…………….(1)
21st term is a + 20d = 24d (putting value of a from (1))
And 5th term is a + 4d= 8d (putting value of a from (1))
Ratio of 21st term : 5th term is
= 3:1