If ration of 3rd and 10 th term in ap is 1:4 then the find the ration of 5th and 19th term
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a + 2d/ a + 9d = 1/4
4a + 8d = a + 9d
3a = d
now,
5th term = a + 4d
a + 4×3a
a + 12a
13a
and ,
19th term = a + 18d
a + 18 × 3a
a + 54 a
55a
so,
5th term / 19th term = 13a/ 55a
13 : 55
4a + 8d = a + 9d
3a = d
now,
5th term = a + 4d
a + 4×3a
a + 12a
13a
and ,
19th term = a + 18d
a + 18 × 3a
a + 54 a
55a
so,
5th term / 19th term = 13a/ 55a
13 : 55
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