Question

In an ap the ratio of 3rd and 7th term is 3:7.find the 4th and 12th term?

Answer 1

$\frac{a + 2d}{a + 6d } = \frac{3}{7 } \\ 7a + 14d = 3a + 18d \\ 4a = 4d \\ a = d$
now we can find ratio of 4th and 12th term easily

Answer 2

Answer:

refers to the attachment.